add workflow

.gitea/workflows/docker-build-push.yml

@@ -0,0 +1,64 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - "main"
+    tags:
+      - "*"
+  workflow_dispatch:
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    if: ${{ !contains(github.event.head_commit.message, '[skip ci]') }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          # Ensure full history and all tags are available
+          fetch-depth: 0
+
+      - name: Set up QEMU (multi-arch)
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: gitea.suda.codes/${{ github.repository }}
+          tags: |
+            type=ref,event=tag
+
+      - name: Determine latest Git tag
+        id: latest
+        shell: bash
+        run: |
+          set -euo pipefail
+          # Fetch tags in case the runner's mirror is stale
+          git fetch --tags --force --quiet || true
+          if tag=$(git describe --tags --abbrev=0 2>/dev/null); then
+            echo "tag=$tag" >> "$GITHUB_OUTPUT"
+          else
+            # Fallback when no tags exist
+            echo "tag=latest" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Log in to container registry
+        uses: docker/login-action@v3
+        with:
+          registry: gitea.suda.codes
+          username: ${{ secrets.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          # Always tag with the latest Git tag; also keep any tags from metadata (e.g., on tag events)
+          tags: |
+            ${{ steps.meta.outputs.tags }}
+            gitea.suda.codes/${{ github.repository }}:${{ steps.latest.outputs.tag }}