push test docker workflow

.gitea/workflows/docker.yaml

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+name: Build and Publish Docker Image
+
+on:
+  push:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to Gitea Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ gitea.server_url }}
+          username: ${{ gitea.actor }}
+          password: ${{ secrets.GITEA_TOKEN }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: |
+            ${{ gitea.server_url }}/${{ gitea.repository }}:latest
+            ${{ gitea.server_url }}/${{ gitea.repository }}:${{ gitea.sha }}

Dockerfile

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+FROM alpine  
+CMD ["echo", "Hello World!!"]