fix(ci): revert to inline runner specs for PR compatibility

Public repos only read .github/runs-on.yml from the default branch.
Custom runner names won't resolve until this PR merges. Revert workflows
to built-in specs; a follow-up commit can switch to the named aliases
defined in runs-on.yml after merge.

Also converts ubuntu-24.04-arm to runs-on arm runner (4cpu-linux-arm64).

Co-authored-by: Claude <noreply@anthropic.com>

Author: samantha-earthmover

.github/workflows/code-quality.yaml

@@ -26,7 +26,7 @@ jobs:
   code-quality:
     name: Code Quality
     timeout-minutes: 15
-    runs-on: runs-on=${{ github.run_id }}/runner=large-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=8cpu-linux-x64
 
     steps:
       - name: Checkout repository

.github/workflows/codespell.yml

@@ -15,7 +15,7 @@ permissions:
 jobs:
   codespell:
     name: Check for spelling errors
-    runs-on: runs-on=${{ github.run_id }}/runner=small-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=2cpu-linux-x64
 
     steps:
       - name: Checkout

.github/workflows/dependency-check.yaml

@@ -29,7 +29,7 @@ jobs:
   check-dependencies:
     name: Check Dependencies
     timeout-minutes: 10
-    runs-on: runs-on=${{ github.run_id }}/runner=small-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=2cpu-linux-x64
 
     steps:
       - name: Checkout repository

.github/workflows/detect-unused-dependencies.yaml

@@ -5,7 +5,7 @@ on:
 
 jobs:
   detect-unused-dependencies:
-    runs-on: runs-on=${{ github.run_id }}/runner=small-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=2cpu-linux-x64
     steps:
       - name: Checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6

.github/workflows/js-ci.yaml

@@ -37,7 +37,7 @@ jobs:
           - host: windows-latest
             build: yarn build --target x86_64-pc-windows-msvc
             target: x86_64-pc-windows-msvc
-          - host: "runs-on=${{ github.run_id }}/runner=default-ubuntu24"
+          - host: "runs-on=${{ github.run_id }}/runner=4cpu-linux-x64"
             target: x86_64-unknown-linux-gnu
             build: yarn build --target x86_64-unknown-linux-gnu --use-napi-cross
             setup: |
@@ -50,7 +50,7 @@ jobs:
           - host: macos-latest
             target: aarch64-apple-darwin
             build: yarn build --target aarch64-apple-darwin
-          - host: "runs-on=${{ github.run_id }}/runner=default-ubuntu24"
+          - host: "runs-on=${{ github.run_id }}/runner=4cpu-linux-x64"
             target: wasm32-wasip1-threads
             build: yarn build --target wasm32-wasip1-threads
             rust: '1.94.1'
@@ -181,7 +181,7 @@ jobs:
         node:
           - "20"
           - "22"
-    runs-on: runs-on=${{ github.run_id }}/runner=default-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=4cpu-linux-x64
     steps:
       - uses: actions/checkout@v6
       - name: Setup node
@@ -207,7 +207,7 @@ jobs:
     name: Test WASI target
     needs:
       - build
-    runs-on: runs-on=${{ github.run_id }}/runner=small-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=2cpu-linux-x64
     defaults:
       run:
         working-directory: ./icechunk-js
@@ -239,7 +239,7 @@ jobs:
   publish:
     name: Publish
     if: github.event_name == 'workflow_dispatch'
-    runs-on: runs-on=${{ github.run_id }}/runner=small-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=2cpu-linux-x64
     defaults:
       run:
         working-directory: ./icechunk-js

.github/workflows/publish-rust-library.yml

@@ -17,7 +17,7 @@ on:
 jobs:
   publish:
     name: Check and publish
-    runs-on: runs-on=${{ github.run_id }}/runner=large-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=8cpu-linux-x64
 
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6

.github/workflows/python-check.yaml

@@ -26,7 +26,7 @@ defaults:
 
 jobs:
   build-wheels:
-    runs-on: runs-on=${{ github.run_id }}/runner=large-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=8cpu-linux-x64
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
@@ -48,7 +48,7 @@ jobs:
           path: icechunk-python/dist
 
   test:
-    runs-on: runs-on=${{ github.run_id }}/runner=default-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=4cpu-linux-x64
     needs: [build-wheels]
     strategy:
       matrix:
@@ -135,7 +135,7 @@ jobs:
           python -m pytest -n 4 -m "not hypothesis"
 
   build-wheels-free-threaded:
-    runs-on: runs-on=${{ github.run_id }}/runner=large-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=8cpu-linux-x64
     steps:
       - uses: actions/checkout@v6
       - uses: actions/setup-python@v6
@@ -157,7 +157,7 @@ jobs:
           path: icechunk-python/dist
 
   test-free-threaded:
-    runs-on: runs-on=${{ github.run_id }}/runner=default-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=4cpu-linux-x64
     needs: [build-wheels-free-threaded]
     steps:
       - uses: actions/checkout@v6
@@ -210,7 +210,7 @@ jobs:
           python -m pytest -n 4 -m "not hypothesis"
 
   test-hypothesis-shard:
-    runs-on: runs-on=${{ github.run_id }}/runner=default-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=4cpu-linux-x64
     needs: [build-wheels]
     strategy:
       fail-fast: false
@@ -276,7 +276,7 @@ jobs:
   test-hypothesis:
     if: always()
     needs: [test-hypothesis-shard]
-    runs-on: runs-on=${{ github.run_id }}/runner=small-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=2cpu-linux-x64
     defaults:
       run:
         working-directory: .
@@ -289,7 +289,7 @@ jobs:
           fi
 
   compat-stateful:
-    runs-on: runs-on=${{ github.run_id }}/runner=small-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=2cpu-linux-x64
     needs: [build-wheels]
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
@@ -327,7 +327,7 @@ jobs:
           python -m pytest tests/test_stateful_compat.py -v
 
   xarray-backends:
-    runs-on: runs-on=${{ github.run_id }}/runner=default-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=4cpu-linux-x64
     needs: [build-wheels]
     strategy:
       matrix:
@@ -428,7 +428,7 @@ jobs:
           python -m pytest -c=../../xarray/pyproject.toml -W ignore --override-ini="strict_markers=false" tests/run_xarray_backends_tests.py
 
   stubtest:
-    runs-on: runs-on=${{ github.run_id }}/runner=small-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=2cpu-linux-x64
     needs: [build-wheels]
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
@@ -458,7 +458,7 @@ jobs:
           python -m mypy.stubtest --ignore-disjoint-bases icechunk._icechunk_python --allowlist stubtest_allowlist.txt
 
   check-xarray-docs:
-    runs-on: runs-on=${{ github.run_id }}/runner=small-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=2cpu-linux-x64
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:

.github/workflows/python-ci.yaml

@@ -46,7 +46,7 @@ defaults:
 jobs:
   version:
     name: Generate dynamic version
-    runs-on: runs-on=${{ github.run_id }}/runner=small-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=2cpu-linux-x64
     defaults:
       run:
         working-directory: .
@@ -133,15 +133,15 @@ jobs:
         # Note: fromJSON converts JSON string to array since GH Actions doesn't support array literals in expressions
         branch: ${{ github.event_name == 'schedule' && fromJSON('["main", "support/v1.x"]') || fromJSON(format('["{0}"]', inputs.branch)) }}
         platform:
-          - runner: "runs-on=${{ github.run_id }}/runner=large-ubuntu24"
+          - runner: "runs-on=${{ github.run_id }}/runner=8cpu-linux-x64"
             target: x86_64
             manylinux: auto
-          # - runner: "runs-on=${{ github.run_id }}/runner=large-ubuntu24"
+          # - runner: "runs-on=${{ github.run_id }}/runner=8cpu-linux-x64"
           #   target: x86
-          - runner: "runs-on=${{ github.run_id }}/runner=large-ubuntu24"
+          - runner: "runs-on=${{ github.run_id }}/runner=8cpu-linux-x64"
             target: aarch64
             manylinux: 2_28
-          - runner: "runs-on=${{ github.run_id }}/runner=large-ubuntu24"
+          - runner: "runs-on=${{ github.run_id }}/runner=8cpu-linux-x64"
             target: armv7
             manylinux: 2_28
     steps:
@@ -190,13 +190,13 @@ jobs:
       matrix:
         branch: ${{ github.event_name == 'schedule' && fromJSON('["main", "support/v1.x"]') || fromJSON(format('["{0}"]', inputs.branch)) }}
         platform:
-          - runner: "runs-on=${{ github.run_id }}/runner=large-ubuntu24"
+          - runner: "runs-on=${{ github.run_id }}/runner=8cpu-linux-x64"
             target: x86_64
-          - runner: "runs-on=${{ github.run_id }}/runner=large-ubuntu24"
+          - runner: "runs-on=${{ github.run_id }}/runner=8cpu-linux-x64"
             target: x86
-          - runner: "runs-on=${{ github.run_id }}/runner=large-ubuntu24"
+          - runner: "runs-on=${{ github.run_id }}/runner=8cpu-linux-x64"
             target: aarch64
-          - runner: "runs-on=${{ github.run_id }}/runner=large-ubuntu24"
+          - runner: "runs-on=${{ github.run_id }}/runner=8cpu-linux-x64"
             target: armv7
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
@@ -303,7 +303,7 @@ jobs:
           path: icechunk-python/dist
 
   sdist:
-    runs-on: runs-on=${{ github.run_id }}/runner=small-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=2cpu-linux-x64
     needs: version
     strategy:
       matrix:
@@ -334,7 +334,7 @@ jobs:
 
   release:
     name: Release
-    runs-on: runs-on=${{ github.run_id }}/runner=small-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=2cpu-linux-x64
     permissions:
       id-token: write # IMPORTANT: this permission is mandatory for trusted publishing
     if: ${{ github.event_name == 'workflow_dispatch' && inputs.pypi_release }}
@@ -349,7 +349,7 @@ jobs:
 
   nightly:
     name: Upload nightly wheels
-    runs-on: runs-on=${{ github.run_id }}/runner=small-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=2cpu-linux-x64
     if: ${{ github.event_name == 'schedule' || github.event_name == 'workflow_dispatch' }}
     needs: [linux, musllinux, windows, macos, sdist]
     steps:

.github/workflows/python-upstream.yaml

@@ -30,7 +30,7 @@ defaults:
 jobs:
   build:
     name: upstream-dev
-    runs-on: runs-on=${{ github.run_id }}/runner=large-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=8cpu-linux-x64
     continue-on-error: true
     if: ${{
       (contains(github.event.pull_request.labels.*.name, 'test-upstream') && github.event_name == 'pull_request')
@@ -248,7 +248,7 @@ jobs:
 
   xarray-backends:
     name: xarray-tests-upstream
-    runs-on: runs-on=${{ github.run_id }}/runner=large-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=8cpu-linux-x64
     if: ${{
       (contains(github.event.pull_request.labels.*.name, 'test-upstream') && github.event_name == 'pull_request')
       || github.event_name == 'workflow_dispatch'

.github/workflows/rust-ci.yaml

@@ -44,7 +44,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ["runs-on=${{ github.run_id }}/runner=large-ubuntu24", "runs-on=${{ github.run_id }}/runner=arm-ubuntu24", macos-15-intel, macos-latest]
+        os: ["runs-on=${{ github.run_id }}/runner=8cpu-linux-x64", "runs-on=${{ github.run_id }}/runner=4cpu-linux-arm64", macos-15-intel, macos-latest]
 
     steps:
       - name: Checkout repository
@@ -189,7 +189,7 @@ jobs:
   wasm-build:
     name: WASM Build
     timeout-minutes: 15
-    runs-on: runs-on=${{ github.run_id }}/runner=large-ubuntu24
+    runs-on: runs-on=${{ github.run_id }}/runner=8cpu-linux-x64
     defaults:
       run:
         working-directory: ./