Update Dockerfile; fix index.html and add build scripts

Dockerfile

@@ -1,8 +1,41 @@
-FROM node:18 as builder
+# syntax=docker/dockerfile:1
+FROM node:22 AS frontend-builder
 
+# Workingdir
+WORKDIR /frontend
+
+# Copy files
+COPY frontend/src/ src/
+COPY frontend/package.json .
+COPY frontend/index.html .
+COPY frontend/tsconfig.json .
+COPY frontend/vite.config.js .
+
+# Install libs
+RUN yarn install
+# Build to dist/
+RUN yarn build
+
+
+FROM node:22 AS backend-builder
+
+# Workingdir
 WORKDIR /app
-COPY package.json /app
 
-RUN yarn
+COPY package.json .
+RUN yarn install
+
+COPY tsconfig.json .
+COPY src/ src/
+
+# Build to dist/
+RUN yarn run build
 
 
+# Final stage
+FROM node:22
+COPY --from=frontend-builder /frontend/dist/ /app/frontend/dist
+COPY --from=backend-builder /app/dist /app/dist
+COPY package.json .
+
+CMD ["yarn", "run", "start"]