patch(integration_test_charm.yaml): Add juju version prefix (#92)

In nested CI calls (e.g. release.yaml calls ci.yaml calls this workflow)
the job name in ci.yaml will not show up on the GitHub Actions sidebar.

If this workflow is called with a matrix (e.g. to test multiple juju
versions), the ci.yaml job name containing the Juju version will be
lost.

So, we add the Juju version to one of the first jobs in this workflow.

(In the UI, when this workflow is called with a matrix, GitHub will
separate each matrix combination and preserve job ordering within a
matrix combination.)

.github/workflows/integration_test_charm.yaml

@@ -76,7 +76,14 @@ jobs:
       file-name: integration_test_charm.yaml
 
   collect-integration-tests:
-    name: Collect integration test groups
+    # In nested CI calls (e.g. release.yaml calls ci.yaml calls this workflow) the job name in
+    # ci.yaml will not show up on the GitHub Actions sidebar.
+    # If this workflow is called with a matrix (e.g. to test multiple juju versions), the ci.yaml
+    # job name containing the Juju version will be lost.
+    # So, we add the Juju version to one of the first jobs in this workflow.
+    # (In the UI, when this workflow is called with a matrix, GitHub will separate each matrix
+    # combination and preserve job ordering within a matrix combination.)
+    name: ${{ inputs.juju-agent-version || inputs.juju-snap-channel }} | Collect integration test groups
     runs-on: ubuntu-latest
     steps:
       - name: Checkout