feat: enable Docker build npm cache (#348)

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:12-alpine
+FROM node:12-alpine as node_modules
 
 RUN apk update && \
     apk --no-cache upgrade && \
@@ -8,37 +8,43 @@ RUN apk update && \
                        alpine-sdk \
                        zeromq-dev
 
-# Install dependencies first, in a different location
-# for easier app bind mounting for local development
-WORKDIR /
+# Enable node-gyp cache
+RUN npm install -g node-gyp-cache@0.2.1 && \
+    npm config set node_gyp node-gyp-cache
+
+# Copy node gyp cache
+COPY docker/cache/.cache /root/.cache
+
+# Copy NPM cache
+COPY docker/cache/.npm /root/.npm
 
-COPY package.json package-lock.json ./
+# Install npm modules
 ENV npm_config_zmq_external=true
+
+COPY package.json package-lock.json /
+
 RUN npm ci --production
 
 FROM node:12-alpine
 
-# While we're using this image for tests
-# We have to run `npm i` and zeromq build fails
-RUN apk add zeromq-dev
-RUN echo npm_config_zmq_external=true >> /etc/environment
+ARG NODE_ENV=production
+ENV NODE_ENV ${NODE_ENV}
 
 LABEL maintainer="Dash Developers <dev@dash.org>"
 LABEL description="DAPI Node.JS"
 
-RUN apk update && apk add --no-cache zeromq-dev
-
 # Copy NPM modules
-COPY package.json package-lock.json ./
-COPY --from=0 /node_modules/ /node_modules
+COPY --from=node_modules /node_modules/ /node_modules
+COPY --from=node_modules /package.json /package.json
+COPY --from=node_modules /package-lock.json /package-lock.json
 
 ENV PATH /node_modules/.bin:$PATH
 
 # Copy project files
 WORKDIR /usr/src/app
-COPY . ./
 
-ARG NODE_ENV=production
-ENV NODE_ENV ${NODE_ENV}
+COPY . .
+
+RUN cp .env.example .env
 
 EXPOSE 2500 2501 2510

docker/cache/.cache/.gitignore

@@ -0,0 +1,2 @@
+*
+!.gitignore

docker/cache/.npm/.gitignore

@@ -0,0 +1,3 @@
+*
+!.gitignore
+