Check out correct commit

.github/workflows/test.yml

@@ -1,33 +1,10 @@
 name: "build-test"
 on: # rebuild any PRs and main branch changes
-  check_run:
-  check_suite:
-  create:
-  delete:
-  deployment:
-  deployment_status:
-  fork:
-  gollum:
-  issue_comment:
-  issues:
-  label:
-  milestone:
-  page_build:
-  project:
-  project_card:
-  project_column:
-  public:
   pull_request:
-  pull_request_review:
-  pull_request_review_comment:
   push:
     # branches:
     #   - master
     #   - 'releases/*'
-  registry_package:
-  release:
-  status:
-  watch:
 
 env:
   SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
@@ -48,6 +25,8 @@ jobs:
     steps:
     - id: checkout
       uses: actions/checkout@v2
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
     - uses: ./
       with:
         status: starting
@@ -82,6 +61,8 @@ jobs:
     steps:
     - id: checkout
       uses: actions/checkout@v2
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
     - id: build
       run: |
         npm install