Merge pull request 'added gitea docker registry workflow' (#3) from dev into prod

Reviewed-on: #3

.gitea/workflows/docker-publish.yml

@@ -7,9 +7,15 @@ on:
 
 jobs:
   docker:
-    runs-on: linux  # make sure your Gitea runner supports Docker
+    runs-on: docker  # make sure your Gitea runner supports Docker
 
     steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Log in to Gitea Container Registry
         run: |
           echo "${{ secrets.REGISTRY_TOKEN }}" | docker login gitea.mrmoku.de -u ${{ secrets.REGISTRY_USER }} --password-stdin