Update build action to explicitly set gitea as http

.gitea/workflows/DRBv3_server_build.yaml

@@ -32,7 +32,7 @@ jobs:
       - name: Login to DockerHub
         uses: docker/login-action@v2
         with:
-          registry: ${{ secrets.LOCAL_GITEA_IP}}:3000 # replace it with your local IP
+          registry: http://${{ secrets.LOCAL_GITEA_IP}}:3000 # replace it with your local IP
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}