feat: Pushes image to repository

.forgejo/workflows/test.yml

@@ -20,3 +20,15 @@ jobs:
         run: |
           echo -e 'FROM alpine\nCMD echo Hello, World!' > Dockerfile
           docker build -t hello-world:latest .
+
+      - name: Login to Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.hamburg.ccc.de
+          username: ${{ secrets.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
+      
+      - name: Push Docker image to Container Registry
+        run: |
+          docker tag hello-world:latest git.hamburg.ccc.de/vimaster/hello-world:latest
+          docker push git.hamburg.ccc.de/vimaster/hello-world:latest