build: add self-host docker publish workflow []

Author: jatinlodhi2002

.github/workflows/sparrow-api-selfhost-publish.yml

@@ -28,8 +28,8 @@ jobs:
       - name: Log in to Docker Hub
         uses: docker/login-action@v3
         with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+          username: ${{ secrets.SPARROW_DOCKERHUB_USERNAME }}
+          password: ${{ secrets.SPARROW_DOCKERHUB_PASSWORD }}
 
       - name: Build and push (multi-arch)
         run: |