created workflow file

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

.gitea/workflows/docker.yaml

@@ -0,0 +1,15 @@
+name: Build Docker Image
+run-name: ${{ gitea.actor }} building ${{ gitea.ref_name }}
+on: [push]
+
+jobs:
+  Docker-Build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Clone Repository
+        uses: actions/chekout@v4
+
+      - name: Build docker image
+        run: |
+          docker build -t umbrella .
+          docker tag umbrella ${{ secrets.REGISTRY_PATH }}/umbrella:latest