CI: add support for test

.github/workflows/build-and-publish.yml

@@ -10,7 +10,8 @@ on:
 
 jobs:
   # define job to build and publish docker image
-  build-and-push-docker-image:
+
+  build-docker-image:
     name: Build Docker image and push to repositories
     # run only when code is compiling and tests are passing
     runs-on: ubuntu-latest
@@ -23,6 +24,46 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v2
 
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}
+
+      - name: Build image and push to Docker Hub and GitHub Container Registry
+        uses: docker/build-push-action@v2
+        with:
+          # relative path to the place where source code with Dockerfile
+          # is located
+          context: .
+          file: docker/Dockerfile
+          # Note: tags has to be all lower-case
+          tags: |
+            glenux/teaching-boilerplate:latest
+          outputs: type=docker,dest=/tmp/teaching-boilerplate.image.tar
+
+      - name: Set current date as env variable
+        run: echo "BUILD_VERSION=v$(date +'%Y%m%d_%H%M')" >> /tmp/env
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: myimage
+          path: /tmp/teaching-boilerplate.image.tar
+
+  test-docker-image:
+    name: Build Docker image and push to repositories
+    needs: build-docker-image
+    runs-on: ubuntu-latest
+
+    steps:
+
+  push-docker-image:
+    needs: test-docker-image
+    name: Build Docker image and push to repositories
+    runs-on: ubuntu-latest
+    steps:
       # setup Docker buld action
       - name: Set up Docker Buildx
         id: buildx
@@ -48,6 +89,4 @@ jobs:
           # build on feature branches, push only on main branch
           push: ${{ github.ref == 'refs/heads/master' }}
 
-      - name: Image digest
+#
-        run: echo ${{ steps.docker_build.outputs.digest }}
-