Dockerfile: Automatically build static files for Web UI

Dockerfile

@@ -3,15 +3,24 @@
 
 FROM docker.io/library/node:18-alpine AS build_node_modules
 
-# Copy Web UI
-COPY src/ /app/
-WORKDIR /app
+# Copy Web UI source and build static files
+COPY webui/ /webui/
+WORKDIR /webui
+RUN npm ci
+RUN npm run build
+
+# Copy server, install requirements
+COPY src/ /server/
+WORKDIR /server
 RUN npm ci --omit=dev
 
 # Copy build result to a new image.
 # This saves a lot of disk space.
 FROM docker.io/library/node:18-alpine
-COPY --from=build_node_modules /app /app
+
+# Copy the server files and the built static files
+COPY --from=build_node_modules /server /app
+COPY --from=build_node_modules /webui/dist /app/www
 
 # Move node_modules one directory up, so during development
 # we don't have to mount it in a volume.