Addition of GitHub Actions workflow (#188)

* changed the name of discord token env variable to be consistent with readme.md

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

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

@@ -0,0 +1,29 @@
+name: neue Docker Image Push
+
+on:
+  release:
+    types: [released]
+
+jobs:
+  push-docker-image:
+    runs-on: ubuntu-latest
+    steps:
+      - name: check repository
+        uses: actions/checkout@v4
+
+      - name: login to docker registry
+        uses: docker/login-action@v3
+        with:
+          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 }}