This fetches the submodules in the Docker image build to have the branding repository ready by the time the app starts, preventing the error we experienced while trying to deploy:
FileNotFoundError: [Errno 2] No such file or directory: 'branding/quackstack/silverduck_templates'
This fetches the submodules in the Docker image build to have the branding repository ready by the time the app starts, preventing the error we experienced while trying to deploy: