Update Dockerfile

Dockerfile

@@ -4,7 +4,7 @@ FROM node:19 as viewer-frontend
 WORKDIR /app
 RUN git clone https://github.com/nerfstudio-project/nerfstudio .
 RUN git checkout 6d51af1a24d692d073a9e0cda06278b6a9d44818
-RUN sed -i "s|websocket_url: 'ws://localhost:7007',|websocket_url: `\${window.location.protocol === 'https:' ? 'wss' : 'ws'}://\${window.location.host}/server`,|" nerfstudio/viewer/app/src/reducer.js
+RUN sed -i "s|websocket_url: 'ws://localhost:7007',|websocket_url: \`\${window.location.protocol === 'https:' ? 'wss' : 'ws'}://\${window.location.host}/server\`,|g" nerfstudio/viewer/app/src/reducer.js
 
 RUN npm install --global yarn --force
 RUN cd nerfstudio/viewer/app && \