Switch caching to use re-actors/cache-python-deps

.github/actions/cache-keys/action.yml

@@ -0,0 +1,47 @@
+---
+
+name: placeholder
+description: placeholder
+
+outputs:
+  cache-key-for-dep-files:
+    description: >-
+      A cache key string derived from the dependency declaration files.
+    value: ${{ steps.calc-cache-key-files.outputs.files-hash-key }}
+
+runs:
+  using: composite
+  steps:
+  - name: >-
+      Calculate dependency files' combined hash value
+      for use in the cache key
+    id: calc-cache-key-files
+    run: |
+      from os import environ
+      from pathlib import Path
+
+      FILE_APPEND_MODE = 'a'
+
+      files_derived_hash = '${{
+          hashFiles(
+            'tox.ini',
+            'pyproject.toml',
+            '.pre-commit-config.yaml',
+            'pytest.ini',
+            'requirements/**',
+            'setup.cfg'
+          )
+      }}'
+
+      print(f'Computed file-derived hash is {files_derived_hash}.')
+
+      with Path(environ['GITHUB_OUTPUT']).open(
+              mode=FILE_APPEND_MODE,
+      ) as outputs_file:
+          print(
+              f'files-hash-key={files_derived_hash}',
+              file=outputs_file,
+          )
+    shell: python
+
+...

.github/workflows/ci-cd.yml

@@ -79,9 +79,16 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: ${{ env.PYTHON_LATEST }}
-        cache: pip
-        cache-dependency-path:
-          requirements/*.txt
+    - name: >-
+        Calculate dependency files' combined hash value
+        for use in the cache key
+      id: calc-cache-key-files
+      uses: ./.github/actions/cache-keys
+    - name: Set up pip cache
+      uses: re-actors/cache-python-deps@release/v1
+      with:
+        cache-key-for-dependency-files: >-
+          ${{ steps.calc-cache-key-files.outputs.cache-key-for-dep-files }}
     - name: Install core libraries for build
       run: python -Im pip install build
     - name: Build sdists and pure-python wheel
@@ -215,6 +222,8 @@ jobs:
     timeout-minutes: 5
     continue-on-error: ${{ matrix.experimental }}
     steps:
+    - name: Checkout project
+      uses: actions/checkout@v4
     - name: Retrieve the project source from an sdist inside the GHA artifact
       uses: re-actors/checkout-python-sdist@release/v2
       with:
@@ -235,8 +244,16 @@ jobs:
       with:
         python-version: ${{ matrix.pyver }}
         allow-prereleases: true
-        cache: pip
-        cache-dependency-path: requirements/*.txt
+    - name: >-
+        Calculate dependency files' combined hash value
+        for use in the cache key
+      id: calc-cache-key-files
+      uses: ./.github/actions/cache-keys
+    - name: Set up pip cache
+      uses: re-actors/cache-python-deps@release/v1
+      with:
+        cache-key-for-dependency-files: >-
+          ${{ steps.calc-cache-key-files.outputs.cache-key-for-dep-files }}
     - name: Install dependencies
       uses: py-actions/py-dependency-install@v4
       with:
@@ -389,8 +406,16 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: 3.13
-        cache: pip
-        cache-dependency-path: requirements/*.txt
+    - name: >-
+        Calculate dependency files' combined hash value
+        for use in the cache key
+      id: calc-cache-key-files
+      uses: ./.github/actions/cache-keys
+    - name: Set up pip cache
+      uses: re-actors/cache-python-deps@release/v1
+      with:
+        cache-key-for-dependency-files: >-
+          ${{ steps.calc-cache-key-files.outputs.cache-key-for-dep-files }}
     - name: Install dependencies
       uses: py-actions/py-dependency-install@v4
       with:

.github/workflows/reusable-linters.yml

@@ -36,8 +36,16 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: ${{ env.PYTHON_LATEST }}
-        cache: pip
-        cache-dependency-path: requirements/*.txt
+    - name: >-
+        Calculate dependency files' combined hash value
+        for use in the cache key
+      id: calc-cache-key-files
+      uses: ./.github/actions/cache-keys
+    - name: Set up pip cache
+      uses: re-actors/cache-python-deps@release/v1
+      with:
+        cache-key-for-dependency-files: >-
+          ${{ steps.calc-cache-key-files.outputs.cache-key-for-dep-files }}
     - name: Cache pre-commit.com virtualenvs
       uses: actions/cache@v4
       with:

CHANGES/93.contrib.rst

@@ -0,0 +1,7 @@
+GitHub Actions CI/CD is now configured to manage caching pip-ecosystem
+dependencies using `re-actors/cache-python-deps`_ -- an action by
+:user:`webknjaz` that takes into account ABI stability and the exact
+version of Python runtime.
+
+.. _`re-actors/cache-python-deps`:
+   https://github.com/marketplace/actions/cache-python-deps