Build all images in one pipeline

.github/workflows/test_buildx_and_publish.yml

@@ -14,19 +14,22 @@ env:
 jobs:
   Test:
     runs-on: ubuntu-latest
+    matrix:
+      phpversion: [8.0, 8.1, 8.2]
+      osversion: [buster, bullseye]
     steps:
       - name: Checkout
         uses: actions/checkout@v3
 
       - name: Build image
         run: |
-          docker build . -t moodle-php-apache
+          docker build ${{phpversion}}/${{osversion}} -t moodle-php-apache
 
       - name: Run tests
         run: |
           docker run --name test0 -d -p 8000:80 \
-              -v $PWD/tests/fixtures:/var/www/html \
-              -v $PWD/tests/docker-entrypoint.d:/docker-entrypoint.d \
+              -v ${{phpversion}}/${{osversion}}/tests/fixtures:/var/www/html \
+              -v ${{phpversion}}/${{osversion}}/tests/docker-entrypoint.d:/docker-entrypoint.d \
               moodle-php-apache
           docker exec test0 php /var/www/html/test.php
           docker exec test0 php /var/www/html/check-ini.php
@@ -93,7 +96,7 @@ jobs:
       - name: Build and publish to Docker Hub and Github registries
         uses: docker/build-push-action@v3
         with:
-          context: .
+          context: ${{phpversion}}/${{osversion}}
           file: Dockerfile
           platforms: linux/amd64,linux/arm64
           push: true