build: avoid progress bar update on yarn install

this will save us ~100TB of unneeded data in the long term.

scripts/build/build.sh

@@ -31,7 +31,7 @@ else
   go run build.go -buildNumber=${CIRCLE_BUILD_NUM} build
 fi
 
-yarn install --pure-lockfile
+yarn install --pure-lockfile --no-progress
 
 source /etc/profile.d/rvm.sh
 rvm use 2.1.9 --default

scripts/circle-test.sh

@@ -14,7 +14,7 @@ cd /home/ubuntu/.go_workspace/src/github.com/grafana/grafana
 
 rm -rf node_modules
 npm install -g yarn
-yarn install --pure-lockfile
+yarn install --pure-lockfile --no-progress
 
 exit_if_fail npm test