Unset CI for leeway build

Author: vulkoingim

.github/workflows/build.yml

@@ -64,6 +64,7 @@ jobs:
 
   build-previewctl:
     name: Build previewctl
+    if: ${{ needs.configuration.outputs.is_main_branch == 'true' || needs.configuration.outputs.preview_enable == 'true' }}
     needs: [configuration]
     concurrency:
       group: ${{ github.head_ref || github.ref }}-build-previewctl
@@ -216,7 +217,8 @@ jobs:
 
           RESULT=0
           set -x
-          leeway build $PR_LEEWAY_TARGET \
+          # CI=true is a var set by GHA. Unsetting it for the build, as yarn builds treat warnings as errors if that var is set to true
+          CI= leeway build $PR_LEEWAY_TARGET \
             --cache $CACHE \
             $TEST \
             -Dversion=$VERSION \