add concurrency limit to actions (#23)

.github/workflows/call-local-docker-build.yaml

@@ -16,6 +16,11 @@ on:
       - 'README.md'
       - '.github/linters/**'
 
+# cancel any previously-started, yet still active runs of this workflow on the same branch
+concurrency:
+  group: ${{ github.ref }}-${{ github.workflow }}
+  cancel-in-progress: true
+
 jobs:
 
   call-docker-build:

.github/workflows/call-super-linter.yaml

@@ -9,6 +9,11 @@ on:
   
   pull_request:
 
+# cancel any previously-started, yet still active runs of this workflow on the same branch
+concurrency:
+  group: ${{ github.ref }}-${{ github.workflow }}
+  cancel-in-progress: true
+
 jobs:
   call-super-linter:
 

templates/call-docker-build.yaml

@@ -16,6 +16,11 @@ on:
       - 'README.md'
       - '.github/linters/**'
 
+# cancel any previously-started, yet still active runs of this workflow on the same branch
+concurrency:
+  group: ${{ github.ref }}-${{ github.workflow }}
+  cancel-in-progress: true
+
 jobs:
   call-docker-build: