Add concurrency settings to PR-based workflows

.github/workflows/check-dist.yml

@@ -18,6 +18,11 @@ on:
 permissions:
   contents: read
 
+# This allows a subsequently queued workflow run to interrupt previous runs
+concurrency:
+  group: '${{ github.workflow }} @ ${{ github.event.pull_request.head.label || github.head_ref || github.ref }}'
+  cancel-in-progress: true
+
 jobs:
   check-dist:
     runs-on: ubuntu-latest

.github/workflows/test.yml

@@ -9,6 +9,11 @@ on:
 permissions:
   contents: read
 
+# This allows a subsequently queued workflow run to interrupt previous runs
+concurrency:
+  group: '${{ github.workflow }} @ ${{ github.event.pull_request.head.label || github.head_ref || github.ref }}'
+  cancel-in-progress: true
+
 jobs:
   test:
     runs-on: ubuntu-latest