Improve docker container

Dockerfile

@@ -1,13 +1,28 @@
-FROM node:lts
-
+FROM node:lts-alpine AS base
 WORKDIR /app
 
 COPY ./package.json ./package.json
-RUN npm install
+
+# Install production dependencies
+FROM base AS install
+
+RUN npm install --omit=dev
+
+# Build project
+FROM install AS build
 
 ENV SKIP_ENV_VALIDATION=true
 
+RUN npm install
+
 COPY . .
 RUN npm run build
 
-CMD ["npm", "run", "start"]
+# Compose release container
+FROM base AS release
+
+COPY --from=install /app/node_modules ./node_modules
+COPY --from=build /app/.next ./.next
+
+EXPOSE 3000
+CMD ["npm", "run", "start"]