Cancel old mypy_primer builds (#8873)

.github/workflows/mypy_primer.yml

@@ -9,13 +9,17 @@ on:
     - '.github/workflows/mypy_primer.yml'
     - '.github/workflows/mypy_primer_comment.yml'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
 jobs:
   mypy_primer:
     name: Run
-    if: github.actor != 'pre-commit-ci[bot]'
     runs-on: ubuntu-latest
-    permissions:
-      contents: read
     strategy:
       matrix:
         shard-index: [0, 1, 2, 3]

.github/workflows/mypy_primer_comment.yml

@@ -14,6 +14,7 @@ permissions:
 jobs:
   comment:
     name: Comment PR from mypy_primer
+    if: ${{ github.event.workflow_run.conclusion == 'success' }}
     runs-on: ubuntu-latest
     steps:
       - name: Download diffs