.github: Cancel outdated comment workflows

When updating a pull request, workflows associated with the previous
version continue to run. A way to prevent that and cancel outdated
workflows is to use concurrency groups.

This commit fixes workflows running on a schedule or on PR comment.
We define each concurrency group such that they are unique to the
pull request (via PR URL) if triggered by event issue_comment.

For each workflow, there's a single concurrency group for all scheduled
runs. That assumes the timeout of scheduled workflows is always shorter
than the duration between two runs.

Signed-off-by: Paul Chaignon <paul@cilium.io>

.github/workflows/aks.yaml

@@ -1,5 +1,6 @@
 name: ConformanceAKS (ci-aks)
 
+# Any change in triggers needs to be reflected in the concurrency group.
 on:
   issue_comment:
     types:
@@ -13,6 +14,10 @@ on:
   #    - "labeled"
   ###
 
+concurrency:
+  group: "${{ github.workflow }} ${{ github.event.issue.pull_request.url || 'scheduled' }}"
+  cancel-in-progress: true
+
 env:
   name: ${{ github.repository_owner }}-${{ github.event.repository.name }}-${{ github.run_id }}
   location: westeurope

.github/workflows/eks.yaml

@@ -1,5 +1,6 @@
 name: ConformanceEKS (ci-eks)
 
+# Any change in triggers needs to be reflected in the concurrency group.
 on:
   issue_comment:
     types:
@@ -13,6 +14,10 @@ on:
   #    - "labeled"
   ###
 
+concurrency:
+  group: "${{ github.workflow }} ${{ github.event.issue.pull_request.url || 'scheduled' }}"
+  cancel-in-progress: true
+
 env:
   clusterName: ${{ github.repository_owner }}-${{ github.event.repository.name }}-${{ github.run_id }}
   region: us-east-2

.github/workflows/gke.yaml

@@ -1,5 +1,6 @@
 name: ConformanceGKE (ci-gke)
 
+# Any change in triggers needs to be reflected in the concurrency group.
 on:
   issue_comment:
     types:
@@ -13,6 +14,10 @@ on:
   #    - "labeled"
   ###
 
+concurrency:
+  group: "${{ github.workflow }} ${{ github.event.issue.pull_request.url || 'scheduled' }}"
+  cancel-in-progress: true
+
 env:
   clusterName: ${{ github.repository_owner }}-${{ github.event.repository.name }}-${{ github.run_id }}
   zone: us-west2-a

.github/workflows/multicluster.yaml

@@ -1,5 +1,6 @@
 name: Multicluster / Cluster mesh (ci-multicluster)
 
+# Any change in triggers needs to be reflected in the concurrency group.
 on:
   issue_comment:
     types:
@@ -13,6 +14,10 @@ on:
   #    - "labeled"
   ###
 
+concurrency:
+  group: "${{ github.workflow }} ${{ github.event.issue.pull_request.url || 'scheduled' }}"
+  cancel-in-progress: true
+
 env:
   clusterName1: ${{ github.repository_owner }}-${{ github.event.repository.name }}-${{ github.run_id }}-mesh-1
   clusterName2: ${{ github.repository_owner }}-${{ github.event.repository.name }}-${{ github.run_id }}-mesh-2