Yarn fix for Jenkins

Dockerfile

@@ -3,8 +3,7 @@ FROM node:8
 RUN curl https://s3.amazonaws.com/cdncliqz/update/ghostery/moab/moab_6a9b26e > /bin/moab && \
     chmod +x /bin/moab
 
-RUN curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version 1.6.0 \
-    export PATH=$HOME/.yarn/bin:$PATH
+RUN npm install -g yarn
 
 ARG UID
 ARG GID
@@ -14,4 +13,5 @@ RUN groupadd jenkins -g $GID \
 USER jenkins
 COPY package.json /home/jenkins/
 COPY yarn.lock /home/jenkins/
-RUN cd /home/jenkins/ && yarn install
+RUN cd /home/jenkins/ && yarn install --frozen-lockfile
+

package.json

@@ -42,7 +42,7 @@
   "homepage": "https://github.com/ghostery/ghostery-extension#readme",
   "dependencies": {
     "base64-js": "^1.2.1",
-    "browser-core": "https://s3.amazonaws.com/cdncliqz/update/edge/ghostery/v7.27/7.27.2.tgz",
+    "browser-core": "https://s3.amazonaws.com/cdncliqz/update/edge/ghostery/v7.27/7.27.2.tgz?v=1",
     "classnames": "^2.2.5",
     "d3": "^4.13.0",
     "d3-scale": "^1.0.6",