allow concurrent RL8/RL9 CI tests

Author: sjpb

.github/workflows/fatimage.yml

@@ -3,7 +3,7 @@ name: Build fat image
 'on':
   workflow_dispatch:
 concurrency:
-  group: ${{ github.ref }}-{{ matrix.os_version }}-{{ matrix.build }} # to branch/PR + OS + build
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ matrix.os_version }}-${{ matrix.build }} # to branch/PR + OS + build
   cancel-in-progress: true
 jobs:
   openstack:

.github/workflows/stackhpc.yml

@@ -9,11 +9,15 @@ on:
 jobs:
   openstack:
     name: openstack-ci
-    concurrency: ${{ github.ref }}-{{ matrix.os_version }} # to branch/PR + OS
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.ref }}-${{ matrix.os_version }} # to branch/PR + OS
+      cancel-in-progress: true
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        os_version: [RL8, RL9]
+        os_version:
+          - RL8
+          - RL9
     env:
       ANSIBLE_FORCE_COLOR: True
       OS_CLOUD: openstack