ci: cancel superseded test runs on the same branch or pull request

.github/workflows/oci-validation.yml

@@ -25,6 +25,11 @@ on:
 permissions:
   contents: read
 
+# A newer push to the same branch or pull request replaces the run in progress.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   check:
     runs-on: ubuntu-latest

.github/workflows/test-features.yml

@@ -112,6 +112,11 @@ on:
 permissions:
   contents: read
 
+# A newer push to the same branch or pull request replaces the run in progress.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   apprise-services:
     runs-on: ubuntu-latest

.github/workflows/test-i18n.yml

@@ -51,6 +51,11 @@ on:
 permissions:
   contents: read
 
+# A newer push to the same branch or pull request replaces the run in progress.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   # Preserve this check ID for existing branch protection rules. This suite
   # includes menu, download and scheduler regressions as well as i18n tests.

.github/workflows/test-offline-qualified.yml

@@ -57,6 +57,11 @@ on:
 permissions:
   contents: read
 
+# A newer push to the same branch or pull request replaces the run in progress.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   offline-python:
     runs-on: ubuntu-latest