Use branch name as default tag for images

This commit sets the branch name as the default tag for the produced image.
It also adds again quay.io (in addition to ghcr.io) as destination for the
images.

.github/workflows/main.yml

@@ -1,9 +1,9 @@
 name: Create kpa-marp-pandoc container image
 
 env:
-  REGISTRY_NAME: ghcr.io
-  CONTAINER_NAME: mmul-it/kpa-marp-pandoc
-  CONTAINER_VERSION: latest
+  REGISTRY_GHCR: ghcr.io/mmul-it
+  REGISTRY_QUAY: quay.io/mmul
+  CONTAINER_NAME: kpa-marp-pandoc
 
 on: [push]
 
@@ -13,8 +13,17 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Build the container image
-      run: docker build . --file Dockerfile --tag ${REGISTRY_NAME}/${CONTAINER_NAME}:${CONTAINER_VERSION}
-    - name: Login into the container registry
-      run: echo ${{ secrets.GHCR_TOKEN }} | docker login ghcr.io -u ${{ vars.GHCR_USER }} --password-stdin
-    - name: Push the image into the container registry
-      run: docker push ${REGISTRY_NAME}/${CONTAINER_NAME}:${CONTAINER_VERSION}
+      run: docker build .
+             --file Dockerfile
+             --tag ${REGISTRY_GHCR}/${CONTAINER_NAME}:${{ github.ref_name }}
+             --tag ${REGISTRY_GHCR}/${CONTAINER_NAME}:latest
+             --tag ${REGISTRY_QUAY}/${CONTAINER_NAME}:${{ github.ref_name }}
+             --tag ${REGISTRY_QUAY}/${CONTAINER_NAME}:latest
+    - name: Login into the GitHub Container Registry
+      run: echo "${{ secrets.GHCR_TOKEN }}" | docker login ${REGISTRY_GHCR} --username "${{ vars.GHCR_USER }}" --password-stdin
+    - name: Login into the Quay Container Registry
+      run: echo "${{ secrets.QUAY_ROBOT_TOKEN }}" | docker login ${REGISTRY_QUAY} --username "${{ vars.QUAY_ROBOT_NAME }}" --password-stdin
+    - name: Push the image into the GitHub Container Registry
+      run: docker push --all-tags ${REGISTRY_GHCR}/${CONTAINER_NAME}
+    - name: Push the image into the Quay Container Registry
+      run: docker push --all-tags ${REGISTRY_QUAY}/${CONTAINER_NAME}