name:Buildon:push:jobs:no-uncommitted-changes:runs-on:ubuntu-lateststeps:-uses:actions/checkout@v2with:ref:${{ github.head_ref }}-name:Run Builduses:actions/setup-node@v1with:node-version:'12.x'-run:npm run build-name:Check working treeid:changesuses:UnicornGlobal/has-changes-action@v1.0.11-name:Check for uncommited changesif:steps.changes.outputs.changed == 1run:git status && echo "Output does not match src/, uncommitted changes exist, follow build instructions from README" && exit 1