Centralize CI to SciML reusable workflows

Convert all CI workflows to the centralized reusable workflows in
SciML/.github (pinned @v1, secrets: inherit on every caller):

- CI.yml: inline tests -> tests.yml@v1 (preserves lts/1/pre x ubuntu-latest x x64 matrix)
- FormatCheck.yml: inline fredrikekre/runic-action -> runic.yml@v1
- SpellCheck.yml: inline crate-ci/typos -> spellcheck.yml@v1
- Downgrade.yml: inline -> downgrade.yml@v1 (preserves if: false, Core group, 1.10/1/pre, skip Pkg,TOML)
- Documentation.yml: already a documentation.yml@v1 caller (unchanged)

dependabot.yml: remove obsolete crate-ci/typos ignore (typos pin now
lives in the central workflow); trim julia ecosystem to dirs with a
Project.toml (/ and /docs).

Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: ChrisRackauckas

.github/dependabot.yml

@@ -5,14 +5,10 @@ updates:
     directory: "/" # Location of package manifests
     schedule:
       interval: "weekly"
-    ignore:
-      - dependency-name: "crate-ci/typos"
-        update-types: ["version-update:semver-patch", "version-update:semver-minor"]
   - package-ecosystem: "julia"
     directories:
       - "/"
       - "/docs"
-      - "/test"
     schedule:
       interval: "daily"
     groups:

.github/workflows/CI.yml

@@ -13,7 +13,6 @@ concurrency:
 jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
-    runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
@@ -25,22 +24,9 @@ jobs:
           - ubuntu-latest
         arch:
           - x64
-    steps:
-      - uses: actions/checkout@v6
-      - uses: julia-actions/setup-julia@v3
-        with:
-          version: ${{ matrix.version }}
-          arch: ${{ matrix.arch }}
-      - uses: julia-actions/julia-downgrade-compat@v2
-        if: ${{ matrix.version == '1.6' }}
-        with:
-          skip: Pkg, TOML
-      - uses: julia-actions/cache@v3
-      - uses: julia-actions/julia-buildpkg@v1
-      - uses: julia-actions/julia-runtest@v1
-      - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v6
-        with:
-          files: lcov.info
-          token: ${{ secrets.CODECOV_TOKEN }}
-          fail_ci_if_error: false
+    uses: "SciML/.github/.github/workflows/tests.yml@v1"
+    with:
+      julia-version: ${{ matrix.version }}
+      julia-arch: ${{ matrix.arch }}
+      os: ${{ matrix.os }}
+    secrets: "inherit"

.github/workflows/Downgrade.yml

@@ -13,25 +13,16 @@ on:
 jobs:
   test:
     if: false
-    runs-on: ubuntu-latest
+    name: "Downgrade"
     strategy:
       matrix:
         group:
           - Core
-        downgrade_mode: ['alldeps']
         julia-version: ['1.10', '1', 'pre']
-    steps:
-      - uses: actions/checkout@v6
-      - uses: julia-actions/setup-julia@v3
-        with:
-          version: ${{ matrix.julia-version }}
-      - uses: julia-actions/julia-downgrade-compat@v2
-#        if: ${{ matrix.version == '1.6' }}
-        with:
-          skip: Pkg,TOML
-      - uses: julia-actions/julia-buildpkg@v1
-      - uses: julia-actions/julia-runtest@v1
-        with:
-          ALLOW_RERESOLVE: false
-        env:
-          GROUP: ${{ matrix.group }}
+    uses: "SciML/.github/.github/workflows/downgrade.yml@v1"
+    with:
+      julia-version: ${{ matrix.julia-version }}
+      group: ${{ matrix.group }}
+      skip: "Pkg,TOML"
+      allow-reresolve: false
+    secrets: "inherit"

.github/workflows/FormatCheck.yml

@@ -11,12 +11,6 @@ on:
 
 jobs:
   runic:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v6
-      - uses: julia-actions/setup-julia@v3
-        with:
-          version: '1'
-      - uses: fredrikekre/runic-action@v1
-        with:
-          version: '1'
+    name: "Runic"
+    uses: "SciML/.github/.github/workflows/runic.yml@v1"
+    secrets: "inherit"

.github/workflows/SpellCheck.yml

@@ -4,10 +4,6 @@ on: [pull_request]
 
 jobs:
   typos-check:
-    name: Spell Check with Typos
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout Actions Repository
-        uses: actions/checkout@v6
-      - name: Check spelling
-        uses: crate-ci/typos@v1.16.23 
+    name: "Spell Check with Typos"
+    uses: "SciML/.github/.github/workflows/spellcheck.yml@v1"
+    secrets: "inherit"