Update files from .github to v0.28.0 [skip ci]

.github/workflows/ci.yml

@@ -6,15 +6,22 @@ name: Formatters & Tests
 
 on:
   push:
-    branches: master
+    branches: [master]
   pull_request:
 
 jobs:
   test:
     if: "!contains(github.event.head_commit.message, 'skip ci')"
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout project
+      - name: Checkout project (pull-request)
+        if: github.event_name == 'pull_request'
+        uses: actions/checkout@v2.3.2
+        with:
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
+          ref: ${{ github.event.pull_request.head.ref }}
+      - name: Checkout project (master)
+        if: github.event_name == 'push'
         uses: actions/checkout@v2
       - name: Label PR
         if: github.event_name == 'pull_request'
@@ -33,7 +40,7 @@ jobs:
         if: github.event.pull_request.user.login == 'alejandrohdezma' && contains(github.event.pull_request.body, 'Scala Steward')
         run: sbt "scalafixEnable; fix" || sbt "scalafmtAll; scalafmtSbt" || true
       - name: Push changes
-        uses: stefanzweifel/git-auto-commit-action@v4
+        uses: stefanzweifel/git-auto-commit-action@v4.5.1
         with:
           commit_message: Run formatter/linter
       - name: Run checks