PT #164169543: Proper usage of Yarn add

concourse/tasks/build-theia-package.sh

@@ -28,7 +28,7 @@ timestamp=`date -u +%Y%m%d%H%M`
 
 base_version=`jq -r .version package.json`
 
-yarn install lerna -g
+yarn global add lerna
 
 # for snapshot build, work the timestamp into package.json version qualifier
 cd "$sources"

concourse/tasks/bump-theia-versions.sh

@@ -10,7 +10,7 @@ echo "theia-version=$theia_version"
 
 # theia extensions
 cd $theia_sources
-yarn install lerna -g
+yarn global add lerna
 for extension_id in $(ls -d theia-*)
 do
     if [ $extension_id != "theia-commons" ]; then

concourse/tasks/bump-versions.sh

@@ -39,7 +39,7 @@ done
 
 # theia extensions
 cd $theia_sources
-yarn install lerna -g
+yarn global add lerna
 for extension_id in $(ls -d theia-*)
 do
     if [ $extension_id != "theia-commons" ]; then

concourse/tasks/theia-rc-build.sh

@@ -26,7 +26,7 @@ else
 fi
 
 cd ${sources}
-yarn install lerna -g
+yarn global add lerna
 lerna version "${version%-*}" || true --exact --no-git-tag-version --no-push --yes
 ./build.sh