Update Dockerfile

Dockerfile

@@ -23,6 +23,7 @@ WORKDIR /opt/node_app/excalidraw
 # Setup npm / yarn / deps
 RUN npm install react react-dom
 RUN npm install workbox-build workbox-window eslint typescript
+RUN npm i @typescript-eslint/eslint-plugin
 
 # Run yarn to install deps
 RUN yarn install