docker: remove contrib package related build commands

Dockerfile

@@ -1,5 +1,4 @@
-# This is the "master" Docker file building the back-office front-end.
-# The front-end only includes the "contrib" package for now.
+# This is the "master" Docker file used to prepare de production building.
 
 FROM node:10-alpine
 
@@ -10,14 +9,5 @@ WORKDIR /app
 
 RUN yarn --frozen-lockfile && yarn cache clean
 
-COPY ./lerna.json /app/lerna.json
-COPY ./packages/contrib/package.json /app/packages/contrib/package.json
-COPY ./packages/contrib/yarn.lock /app/packages/contrib/yarn.lock
-
-RUN yarn lerna bootstrap && yarn cache clean
-
 COPY ./knexfile.js /app/knexfile.js
 COPY ./db /app/db
-COPY ./packages /app/packages
-
-RUN yarn build