Only one concurrent build from each group

from https://docs.github.com/en/actions/learn-github-actions/workflow-syntax-for-github-actions#concurrency to actions/checkout#58 and https://docs.github.com/en/actions/learn-github-actions/contexts#github-context

Author: lorenzwalthert

.github/workflows/R-CMD-check.yaml

@@ -16,6 +16,11 @@ on:
 
 name: R-CMD-check
 
+concurrency:
+  group: ${{ github.action }}-${{ github.event_path }}
+  cancel-in-progress: true
+
+
 jobs:
   R-CMD-check:
     runs-on: ${{ matrix.config.os }}

.github/workflows/cancel.yaml

@@ -8,6 +8,11 @@ on:
 
 name: test-coverage
 
+concurrency:
+  group: ${{ github.action }}-${{ github.event_path }}
+  cancel-in-progress: true
+
+
 jobs:
   test-coverage:
     runs-on: macOS-latest