travis automatically uses yarn if the yarn lockfile is detected. trying to override

Author: nustiueudinastea

.travis.yml

@@ -12,6 +12,9 @@ before_install:
   - sudo apt-get install -y make
   - make test-image deps
 
+install:
+  - npm install
+
 env:
   - GROUP=weaveworksdemos COMMIT="${TRAVIS_COMMIT}" TAG="${TRAVIS_TAG}" REPO=front-end;
 

Dockerfile

@@ -2,15 +2,15 @@ FROM node:4-alpine
 ENV NODE_ENV "production"
 ENV PORT 8079
 EXPOSE 8079
-#RUN addgroup mygroup && adduser -D -G mygroup myuser && mkdir -p /usr/src/app && chown -R myuser /usr/src/app
+RUN addgroup mygroup && adduser -D -G mygroup myuser && mkdir -p /usr/src/app && chown -R myuser /usr/src/app
 
 # Prepare app directory
 WORKDIR /usr/src/app
 COPY package.json /usr/src/app/
 COPY yarn.lock /usr/src/app/
-#RUN chown -R myuser /usr/src/app/
+RUN chown myuser /usr/src/app/yarn.lock
 
-#USER myuser
+USER myuser
 RUN yarn install
 
 COPY . /usr/src/app