feat(k8s): back up control plane configuration

.gitea/workflows/test-automated-nfs-backup.yaml

@@ -1,4 +1,4 @@
-name: Test automated-nfs-backup
+name: Test Kubernetes backup scripts
 
 on:
   push:
@@ -15,3 +15,10 @@ jobs:
         uses: actions/checkout@v4
       - name: Run automated NFS backup tests
         run: bash k8s/test/test-automated-nfs-backup.sh
+  test-k3s-control-plane-config-backup:
+    runs-on: runner-slim
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - name: Run k3s control-plane configuration backup tests
+        run: bash k8s/test/test-backup-k3s-control-plane-config.sh