TST: setup Python dependencies caching

Author: neutrinoceros

.github/workflows/build-test.yaml

@@ -49,24 +49,28 @@ jobs:
         sync_args: [--extra=full]
         tests-type: [unit]
         test-runner: [pytest]
+        cache-suffix: [null]
         include:
           - os: windows-latest
             python-version: '3.13'
             sync_args: --extra=full
             tests-type: unit
             test-runner: pytest
+            label: alldeps
           - os: ubuntu-22.04
             python-version: '3.10.4'
             sync_args: --resolution=lowest
             tests-type: unit
             test-runner: pytest
+            cache-suffix: oldestdeps
           - os: ubuntu-latest
             # this job is necessary for non-answer, 'yield' based tests
             # because pytest doesn't support such tests
             python-version: '3.10'
             sync_args: "--extra=full --group=nosetest"
             tests-type: unit
             test-runner: nose
+            lcache-suffix: alldeps-nose
           - os: ubuntu-latest
             # answer tests use 'yield', so they require nose
             # they are also attached to a specific, occasionally updated, Python version
@@ -75,12 +79,14 @@ jobs:
             sync_args: "--extra=full --group=nosetest"
             tests-type: answer
             test-runner: nose
+            cache-suffix: alldeps-nose
           - os: ubuntu-latest
             # minimal tests with latest Python and no optional dependencies
             python-version: '3.14'
             sync_args: null
             tests-type: unit
             test-runner: pytest
+            cache-suffix: minimal
 
     runs-on: ${{ matrix.os }}
 
@@ -90,14 +96,15 @@ jobs:
       cancel-in-progress: true
 
     steps:
+    - name: Checkout repo (bare)
+      if: matrix.tests-type != 'answer'
+      uses: actions/checkout@v5
     - name: Set up Python
       uses: astral-sh/setup-uv@v7
       with:
         python-version: ${{ matrix.python-version }}
-        enable-cache: false
-    - name: Checkout repo (bare)
-      if: matrix.tests-type != 'answer'
-      uses: actions/checkout@v5
+        cache-suffix: ${{ matrix.cache-suffix }}
+        prune-cache: false
     - name: Checkout repo (with submodules)
       if: matrix.tests-type == 'answer'
       uses: actions/checkout@v5
@@ -136,17 +143,15 @@ jobs:
       cancel-in-progress: true
 
     steps:
+    - name: Checkout repo (with submodules)
+      uses: actions/checkout@v5
+      with:
+        submodules: true
     - name: Set up Python
       uses: astral-sh/setup-uv@v7
       with:
         python-version: '3.11'
         enable-cache: false
-
-    - name: Checkout repo (with submodules)
-      uses: actions/checkout@v5
-      with:
-        submodules: true
-
     - name: Install dependencies and yt
       shell: bash
       env:

.github/workflows/type-checking.yaml

@@ -33,7 +33,8 @@ jobs:
         # so that we always get compatible versions of
         # core dependencies at type-check time
         python-version: '3.10'
-        enable-cache: false
+        prune-cache: false
+        cache-suffix: typecheck
 
     - name: Build
       run: uv sync --group typecheck