ci: multi-stage build, including lint and tests

.dockerignore

@@ -1,6 +1,5 @@
 /node_modules
 /scripts
-/test
 .circleci
 .editorconfig
 .gitignore

.verb.md

@@ -95,7 +95,7 @@ $ curl http://localhost:3004/cmd-cron?def=echo%20foo&cron=*%20*%20*%20*%20*
 **References:**
 - https://capgemini.github.io/development/multi-stage-builds-in-docker/
 - https://codefresh.io/blog/node_docker_multistage/
-- https://blog.alexellis.io/mutli-stage-docker-builds/
+- Using multi-stage builds to reduce Go images: https://blog.alexellis.io/mutli-stage-docker-builds/
 - https://github.com/yamalight/node-docker-pkg-demo
 
 ## Todo

Dockerfile

@@ -1,3 +1,6 @@
+# --------------------------------------
+#               BASE NODE
+# --------------------------------------
 FROM node:8.5.0-alpine as BASE
 
 ARG PORT=3000
@@ -7,14 +10,47 @@ ENV HOME=/app
 RUN mkdir -p $HOME
 WORKDIR $HOME
 
-COPY ./package.json ./index.js ./
+COPY package.json package-lock.json ./
 
-RUN npm install --production
+# --------------------------------------
+#              DEPENDENCIES
+# --------------------------------------
+FROM BASE as DEPENDENCIES
+
+RUN npm install --only=production
+
+# copy production node_modules aside
+RUN cp -R node_modules prod_node_modules
+
+# install ALL node_modules, including 'devDependencies'
+RUN npm install
+
+
+# --------------------------------------
+#                  TEST
+# --------------------------------------
+# run linters, setup and tests
+FROM dependencies AS TEST
+
+COPY .eslintrc.json .
 
 COPY /src ./src/
 
+COPY /test ./test/
+
+RUN  npm run lint && npm run test
+
+# --------------------------------------
+#                 RELEASE
+# --------------------------------------
 FROM BASE as RELEASE
 
+# copy production node_modules
+COPY --from=dependencies /app/prod_node_modules ./node_modules
+
+# copy app sources
+COPY /src ./src/
+
 EXPOSE $PORT
 
 CMD ["npm", "run", "start"]