fix docker build

Author: novatechflow

.github/workflows/docker.yml

@@ -9,6 +9,10 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    env:
+      DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME || '' }}
+      DOCKERHUB_TOKEN: ${{ secrets.DOCKERHUB_TOKEN || '' }}
+      IMAGE_NAME: docai-toolkit
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -17,15 +21,15 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Login to DockerHub
-        if: secrets.DOCKERHUB_USERNAME && secrets.DOCKERHUB_TOKEN
+        if: 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: Build image
         uses: docker/build-push-action@v6
         with:
           context: .
-          push: ${{ secrets.DOCKERHUB_USERNAME && secrets.DOCKERHUB_TOKEN }}
-          tags: ${{ secrets.DOCKERHUB_USERNAME }}/docai-toolkit:latest
+          push: ${{ env.DOCKERHUB_USERNAME != '' && env.DOCKERHUB_TOKEN != '' }}
+          tags: ${{ (env.DOCKERHUB_USERNAME != '' && env.DOCKERHUB_TOKEN != '') && format('{0}/{1}:latest', env.DOCKERHUB_USERNAME, env.IMAGE_NAME) || format('{0}:latest', env.IMAGE_NAME) }}