ci: run "lint" in codebuild #4016

Problem:
lint job doesn't run in the private repo.

Solution:
As a temporary workaround, run lint in `linuxTests.yml`.
TODO: create a separate codebuild task for lint.

Author: justinmk3

buildspec/linuxTests.yml

@@ -44,6 +44,9 @@ phases:
     build:
         commands:
             - export HOME=/home/codebuild-user
+            # TODO: run lint as a separate codebuild job.
+            - npm run testCompile
+            - npm run lint
             - xvfb-run npm test --silent
             - VCS_COMMIT_ID="${CODEBUILD_RESOLVED_SOURCE_VERSION}"
             - CI_BUILD_URL=$(echo $CODEBUILD_BUILD_URL | sed 's/#/%23/g') # Encode `#` in the URL because otherwise the url is clipped in the Codecov.io site