ci: Fix Composer caching

Author: linc

.github/workflows/php.yml

@@ -16,17 +16,16 @@ jobs:
       with:
         php-version: '8.5'
 
-    - name: Validate composer.json and composer.lock
-      run: composer validate --strict
-
-    - name: Cache Composer packages
+    - name: Get Composer cache directory
       id: composer-cache
+      run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+    - name: Cache dependencies
       uses: actions/cache@v4
       with:
-        path: vendor
-        key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
-        restore-keys: |
-          ${{ runner.os }}-php-
+        path: ${{ steps.composer-cache.outputs.dir }}
+        key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+        restore-keys: ${{ runner.os }}-composer-
 
     - name: Install dependencies
       run: composer install --prefer-dist --no-progress