Fix custom-cache-suffix

Author: swissspidy

.github/workflows/reusable-functional.yml

@@ -76,13 +76,18 @@ jobs:
         run: |
           sudo sed -i 's/^.*policy.*coder.*none.*PDF.*//' /etc/ImageMagick-6/policy.xml
 
+      # This date is used to ensure that the PHP compatibility cache is cleared at least once every week.
+      # http://man7.org/linux/man-pages/man1/date.1.html
+      - name: "Get last Monday's date"
+        id: get-date
+        run: echo "date=$(/bin/date -u --date='last Mon' "+%F")" >> "$GITHUB_OUTPUT"
+
       - name: Install Composer dependencies & cache dependencies
         uses: "ramsey/composer-install@65e4f84970763564f46a70b8a54b90d033b3bdda" # v3
         env:
           COMPOSER_ROOT_VERSION: dev-${{ github.event.repository.default_branch }}
         with:
-          # Bust the cache at least once a month - output format: YYYY-MM.
-          custom-cache-suffix: $(date -u "+%Y-%m")
+          custom-cache-suffix: ${{ steps.get-date.outputs.date }}
 
       # MySQL 8.4 requires explicit loading of mysql_native_password plugin
       - name: Determine MySQL authentication configuration

.github/workflows/reusable-unit.yml

@@ -38,13 +38,18 @@ jobs:
         env:
           COMPOSER_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
+      # This date is used to ensure that the PHP compatibility cache is cleared at least once every week.
+      # http://man7.org/linux/man-pages/man1/date.1.html
+      - name: "Get last Monday's date"
+        id: get-date
+        run: echo "date=$(/bin/date -u --date='last Mon' "+%F")" >> "$GITHUB_OUTPUT"
+
       - name: Install Composer dependencies & cache dependencies
         uses: "ramsey/composer-install@65e4f84970763564f46a70b8a54b90d033b3bdda" # v3
         env:
           COMPOSER_ROOT_VERSION: dev-${{ github.event.repository.default_branch }}
         with:
-          # Bust the cache at least once a month - output format: YYYY-MM.
-          custom-cache-suffix: $(date -u "+%Y-%m")
+          custom-cache-suffix: ${{ steps.get-date.outputs.date }}
 
       # PHPUnit 10+ may fail a test run when the "old" configuration format is used.
       # Luckily, there is a built-in migration tool since PHPUnit 9.3.