Add concurrency configuration to all workflows

Configure workflows such that running workflows will be cancelled when a
new workflow is triggered. See [1] for documentation.

[1]: https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/control-the-concurrency-of-workflows-and-jobs

.github/workflows/build-image.yaml

@@ -6,12 +6,17 @@ name: Build container image
 # documentation.
 
 on:
-  push:
-    branches: [main]
-    # Publish semver tags as releases.
-    tags: ['v*.*.*']
-  pull_request:
-    branches: [main]
+  workflow_call:
+# push:
+#   branches: [main]
+#   # Publish semver tags as releases.
+#   tags: ['v*.*.*']
+# pull_request:
+#   branches: [main]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
 
 env:
   # Use docker.io for Docker Hub if empty

.github/workflows/precommit.yaml

@@ -1,9 +1,13 @@
 name: Run pre-commit checks
 
 on:
-  push:
-  pull_request:
   workflow_call:
+# push:
+# pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
 
 jobs:
   run-linters:

.github/workflows/tests.yaml

@@ -1,8 +1,13 @@
 name: Run tests
 
 on:
-  push:
-  pull_request:
+  workflow_call:
+# push:
+# pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
 
 jobs:
   run-tests:

.github/workflows/validate-manifests.yaml

@@ -24,6 +24,10 @@ on:
         default: main
         required: false
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   validate-manifests:
     runs-on: ubuntu-latest