refactor(dockerfile): builder multistage pattern & random uid user support

Dockerfile

@@ -1,41 +1,34 @@
-FROM node:10-alpine
-LABEL maintainer="https://github.com/bufferoverflow/verdaccio-gitlab"
-
-RUN apk --no-cache add wget openssl dumb-init && \
-    apk del openssl
-
-ENV APPDIR /usr/local/app
+FROM node:10-alpine as builder
 
-WORKDIR $APPDIR
+WORKDIR /opt/verdaccio-gitlab-build
+COPY . .
 
-ADD . $APPDIR
+ENV NODE_ENV=production \
+    VERDACCIO_BUILD_REGISTRY=https://registry.npmjs.org/
 
-ENV NODE_ENV=production
-
-RUN npm config set registry https://registry.npmjs.org/ && \
+RUN yarn config set registry $VERDACCIO_BUILD_REGISTRY && \
     yarn install --production=false && \
     yarn build && \
     yarn cache clean && \
-    yarn install --production=true --pure-lockfile && \
-    yarn add file:.
-
-RUN mkdir -p /verdaccio/storage /verdaccio/conf
+    yarn install --production=true --pure-lockfile
 
-ADD docker-verdaccio-gitlab.config.yaml /verdaccio/conf/config.yaml
 
-RUN addgroup -S verdaccio && adduser -S -G verdaccio verdaccio && \
-    chown -R verdaccio:verdaccio "$APPDIR" && \
-    chown -R verdaccio:verdaccio /verdaccio
 
-USER verdaccio
+FROM verdaccio/verdaccio:4.x-next
+LABEL maintainer="https://github.com/bufferoverflow/verdaccio-gitlab"
 
-ENV PORT 4873
-ENV PROTOCOL http
+# Go back to root to be able to install the plugin
+USER root
 
-EXPOSE $PORT
+COPY --from=builder /opt/verdaccio-gitlab-build/lib /opt/verdaccio-gitlab/lib
+COPY --from=builder /opt/verdaccio-gitlab-build/package.json /opt/verdaccio-gitlab/package.json
+COPY --from=builder /opt/verdaccio-gitlab-build/node_modules /opt/verdaccio-gitlab/node_modules
 
-VOLUME ["/verdaccio"]
+ADD conf/docker.yaml /verdaccio/conf/config.yaml
 
-ENTRYPOINT ["/usr/bin/dumb-init", "--"]
+# Inherited from parent image
+WORKDIR $VERDACCIO_APPDIR
+RUN ln -s /opt/verdaccio-gitlab/lib /verdaccio/plugins/verdaccio-gitlab
 
-CMD $APPDIR/node_modules/.bin/verdaccio --config /verdaccio/conf/config.yaml --listen $PROTOCOL://0.0.0.0:${PORT}
+# Inherited from parent image
+USER $VERDACCIO_USER_UID

docker-verdaccio-gitlab.config.yaml → conf/docker.yaml

@@ -1,4 +1,6 @@
-storage: /verdaccio/storage
+storage: /verdaccio/storage/data
+
+plugins: /verdaccio/plugins
 
 listen:
   - 0.0.0.0:4873

docker-compose.yml

@@ -15,20 +15,19 @@ services:
       - gitlab-data:/var/opt/gitlab
 
   verdaccio:
-    image: verdaccio/verdaccio
     restart: always
     ports:
       - '4873:4873'
     build:
       context: .
       dockerfile: Dockerfile
     volumes:
-      - verdaccio:/verdaccio
+      - verdaccio-storage:/verdaccio/storage
     links:
       - gitlab
 
 volumes:
   gitlab-config:
   gitlab-log:
   gitlab-data:
-  verdaccio:
+  verdaccio-storage: