Merge branch 'issue/78' into 'develop'

Issue #78: Exchange NPM by equivalent tool: YARN

See merge request !62

.gitlab-ci.yml

@@ -23,12 +23,12 @@ stages:
 run_tests:
     stage: test
     before_script:
-        - npm install --silent
+        - yarn install --frozen-lockfile --silent --non-interactive
     script:
         - mv config/ci_test.yaml.example config/test.yaml
         - mv config/ci_test.env.example config/test.env
-        - npm test
-        - npm run lint
+        - yarn test
+        - yarn run lint
     tags:
         - node
         - postgres

Dockerfile

@@ -18,6 +18,7 @@ ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /tini
 # where available (npm@5+)
 
 COPY package*.json $WORKSPACE
+COPY yarn.lock $WORKSPACE
 RUN \
     chmod +x /tini &&\
     chown -R node:node $WORKSPACE
@@ -25,7 +26,7 @@ RUN \
 USER node
 WORKDIR $WORKSPACE
 
-RUN npm install
+RUN yarn install --frozen-lockfile --silent --non-interactive
 
 # Bundle app source
 # COPY copy files as root so chown must be used