feat: add configuration to docker hub

.github/workflows/doktainer-image.yml

@@ -51,6 +51,7 @@ on:
   workflow_dispatch:
 
 env:
+  DOCKERHUB_IMAGE: doktainer/doktainer
   IMAGE_NAME: ghcr.io/${{ github.repository_owner }}/doktainer
 
 jobs:
@@ -75,11 +76,18 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Log in to Docker Hub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
       - name: Extract image metadata
         id: meta
         uses: docker/metadata-action@v5
         with:
-          images: ${{ env.IMAGE_NAME }}
+          images: ${{ env.IMAGE_NAME }},${{ env.DOCKERHUB_IMAGE }}
           tags: |
             type=raw,value=latest,enable={{is_default_branch}}
             type=ref,event=branch