Merge pull request #78 from robinson/master

multi stage build docker, to minimize the docker image

Dockerfile

@@ -1,20 +1,30 @@
-FROM node:16-buster-slim
-
-RUN apt-get update && \
-    apt-get install -y chromium traceroute && \
-    chmod 755 /usr/bin/chromium && \
-    rm -rf /var/lib/apt/lists/*
+# Build stage
+FROM node:16-buster-slim AS build
 
 WORKDIR /app
 
 COPY package.json yarn.lock ./
 
-RUN yarn install && \
+RUN apt-get update && \
+    yarn install --production && \
     rm -rf /app/node_modules/.cache
 
 COPY . .
 
-RUN yarn build
+RUN yarn build --production
+
+# Final stage
+FROM node:16-buster-slim AS final
+
+WORKDIR /app
+
+COPY package.json yarn.lock ./
+COPY --from=build /app .
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends chromium traceroute && \
+    chmod 755 /usr/bin/chromium && \
+    rm -rf /var/lib/apt/lists/* /app/node_modules/.cache
 
 EXPOSE ${PORT:-3000}