Addition of GitHub Actions workflow (#189)

* added github actions workflow for building and pushing docker image to dockerhub on release

* changed workflow to actually build and push to dockerhub

.github/workflows/push-docker-image.yml

@@ -6,6 +6,8 @@ on:
 
 jobs:
   push-docker-image:
+    env:
+      docker_repo: simploka/neue
     runs-on: ubuntu-latest
     steps:
       - name: check repository
@@ -17,13 +19,10 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-      - name: test github actions variable
-        run: echo "${{ github.event.release.tag_name }}"
-
-#      - name: build and push docker image to registry
-#        uses: docker/build-push-action@v5
-#        with:
-#          push: true
-#          tags: |
-#            simploka/neue:latest
-#            simploka/neue:${{ github.event.release.tag_name }}
+      - name: build and push docker image to registry
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          tags: |
+            ${{ docker_repo }}:${{ github.event.release.tag_name }}
+            ${{ docker_repo }}:latest