Improve CI concurrency robustness (#1423)

.github/workflows/release.yaml

@@ -77,5 +77,5 @@ jobs:
     - name: Run notebook checks
       run: pytest --nbmake --durations=10 --reruns=10 docs/tutorials
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
+  group: ${{ github.workflow }}-${{ github.event.pull_request.head.label || github.head_ref || github.ref }}
   cancel-in-progress: true

.github/workflows/style.yaml

@@ -125,5 +125,5 @@ jobs:
     - name: Run pyupgrade checks
       run: pyupgrade --py39-plus $(find . -path ./docs/src -prune -o -name "*.py" -print)
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
+  group: ${{ github.workflow }}-${{ github.event.pull_request.head.label || github.head_ref || github.ref }}
   cancel-in-progress: true

.github/workflows/tests.yaml

@@ -115,5 +115,5 @@ jobs:
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
+  group: ${{ github.workflow }}-${{ github.event.pull_request.head.label || github.head_ref || github.ref }}
   cancel-in-progress: true

.github/workflows/tutorials.yaml

@@ -35,5 +35,5 @@ jobs:
     - name: Run notebook checks
       run: pytest --nbmake --durations=10 --reruns=10 docs/tutorials
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
+  group: ${{ github.workflow }}-${{ github.event.pull_request.head.label || github.head_ref || github.ref }}
   cancel-in-progress: true