Fix GitHub Action

Author: xiaoman1221

.github/workflows/build.yml

@@ -80,6 +80,9 @@ jobs:
     permissions:
       contents: read
       packages: write
+    env:
+      DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
+      DOCKERHUB_TOKEN: ${{ secrets.DOCKERHUB_TOKEN }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -99,19 +102,19 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Login to Docker Hub
-        if: github.event_name != 'pull_request' && secrets.DOCKERHUB_USERNAME != '' && secrets.DOCKERHUB_TOKEN != ''
+        if: github.event_name != 'pull_request' && env.DOCKERHUB_USERNAME != '' && env.DOCKERHUB_TOKEN != ''
         uses: docker/login-action@v3
         with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          username: ${{ env.DOCKERHUB_USERNAME }}
+          password: ${{ env.DOCKERHUB_TOKEN }}
 
       - name: Compute image list
         id: images
         run: |
           IMAGES="ghcr.io/${{ github.repository }}"
-          if [ -n "${{ secrets.DOCKERHUB_USERNAME }}" ] && [ -n "${{ secrets.DOCKERHUB_TOKEN }}" ]; then
+          if [ -n "$DOCKERHUB_USERNAME" ] && [ -n "$DOCKERHUB_TOKEN" ]; then
             IMAGES="${IMAGES}
-          docker.io/${{ secrets.DOCKERHUB_USERNAME }}/domain-manager"
+          docker.io/$DOCKERHUB_USERNAME/domain-manager"
           fi
           printf 'images<<EOF\n%s\nEOF\n' "$IMAGES" >> "$GITHUB_OUTPUT"