temp reduce Dockerhub load, improve caching

Author: gesinn-it-gea

.github/workflows/main.yml

@@ -12,6 +12,7 @@ jobs:
 
     strategy:
       fail-fast: false
+      max-parallel: 2
       matrix:
         mediawiki_version: ['1.45', '1.44', '1.43', '1.39']
         target_repository: ['mediawiki', 'mediawiki-ci']
@@ -45,11 +46,13 @@ jobs:
       - name: Cache Docker layers
         uses: actions/cache@v4
         with:
-          path: /tmp/.buildx-cache/${{ matrix.mediawiki_version }}
-          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          path: /tmp/.buildx-cache/${{ matrix.mediawiki_version }}/php${{ matrix.php_version }}
+          key: ${{ runner.os }}-buildx-${{ matrix.mediawiki_version }}-${{ matrix.php_version }}
           restore-keys: |
+            ${{ runner.os }}-buildx-${{ matrix.mediawiki_version }}-
             ${{ runner.os }}-buildx-
 
+
       - uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKER_HUB_USERNAME }}
@@ -105,9 +108,11 @@ jobs:
           push: true
           tags: ${{ env.TAGS }}
           target: ${{ matrix.target_repository }}
-          cache-from: type=local,src=/tmp/.buildx-cache/${{ matrix.mediawiki_version }}
-          cache-to: type=local,dest=/tmp/.buildx-cache/${{ matrix.mediawiki_version }}
-          platforms: linux/amd64,linux/arm64
+          cache-from: type=local,src=/tmp/.buildx-cache/${{ matrix.mediawiki_version }}/php${{ matrix.php_version }}
+          cache-to: type=local,dest=/tmp/.buildx-cache/${{ matrix.mediawiki_version }}/php${{ matrix.php_version }},mode=max
+          # platforms: linux/amd64,linux/arm64
+          # temp. build only amd64:
+          platforms: linux/amd64
 
       - name: Image digest
         run: echo ${{ steps.docker_build.outputs.digest }}