新增Gitea Actions蓝绿发布workflow

手动触发(workflow_dispatch)，构建镜像后调用宿主机上的
/opt/apps/im-manager/deploy.sh完成蓝绿切换。

.gitea/workflows/deploy.yml

@@ -0,0 +1,34 @@
+name: Deploy im-manager (Blue-Green)
+
+on:
+  workflow_dispatch:
+    inputs:
+      image_tag:
+        description: '镜像tag，留空则使用commit短哈希'
+        required: false
+
+jobs:
+  deploy:
+    runs-on: deploy-host
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: 确定镜像tag
+        id: vars
+        run: |
+          TAG="${{ github.event.inputs.image_tag }}"
+          [ -z "$TAG" ] && TAG=$(git rev-parse --short HEAD)
+          echo "tag=$TAG" >> "$GITHUB_OUTPUT"
+
+      - name: 构建镜像(前端+后端一体，自包含多阶段构建)
+        run: docker build -t im-manager:${{ steps.vars.outputs.tag }} .
+
+      - name: 蓝绿部署
+        env:
+          MYSQL_DSN: ${{ secrets.MYSQL_DSN }}
+          REDIS_ADDR: ${{ secrets.REDIS_ADDR }}
+          REDIS_DB: ${{ secrets.REDIS_DB }}
+          REDIS_PASSWORD: ${{ secrets.REDIS_PASSWORD }}
+          TOKEN_SECRET_KEY: ${{ secrets.TOKEN_SECRET_KEY }}
+        run: |
+          IMAGE=im-manager:${{ steps.vars.outputs.tag }} /opt/apps/im-manager/deploy.sh