[skip ci] Remove explicit SKIP CI workflow logic

GitHub has it built-in now: https://github.blog/changelog/2021-02-08-github-actions-skip-pull-request-and-push-workflows-with-skip-ci/

.github/workflows/build.yml

@@ -22,7 +22,6 @@ jobs:
   build:
     name: Build app
     needs: check_wrapper
-    if: "!startsWith(github.event.head_commit.message, '[SKIP CI]')"
     runs-on: ubuntu-latest
 
     steps: