Checkout based on git reference

Author: hehaifengcn

.github/workflows/docker.yaml

@@ -25,7 +25,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
         with:
-            ref: ${{ inputs.commit || 'main' }}
+            ref: ${{ github.ref || inputs.commit || 'main' }}
 
       - name: Log in to Docker Hub
         uses: docker/login-action@v3