ci: fix

.github/workflows/build-dev-image.yaml

@@ -11,6 +11,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
       - name: Generate Tag
+        id: generate_tag
         run: |
           # 获取分支名称，把/替换为-
           echo ${{ github.ref }} | sed 's/\//-/g'
@@ -20,4 +21,4 @@ jobs:
       - name: Build Docker Image
         run: |
           docker buildx create --name mybuilder --use
-          docker build -t rockchin/langbot:${{ steps.generate-tag.outputs.tag }} . --push
+          docker build -t rockchin/langbot:${{ steps.generate_tag.outputs.tag }} . --push