Add concurrency groups to cancel redundant workflow runs

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: stephanebruckert

.github/workflows/deploy-k3s.yml

@@ -8,6 +8,10 @@ on:
     branches: [master]
   workflow_dispatch:
 
+concurrency:
+  group: deploy-k3s
+  cancel-in-progress: true
+
 jobs:
   deploy:
     runs-on: self-hosted

.github/workflows/deploy-lambda.yml

@@ -15,6 +15,10 @@ on:
     branches: [master]
   workflow_dispatch:
 
+concurrency:
+  group: deploy-lambda
+  cancel-in-progress: true
+
 env:
   AWS_REGION: eu-west-1
 

.github/workflows/terraform.yml

@@ -24,6 +24,10 @@ on:
       - ".github/workflows/terraform.yml"
   workflow_dispatch:
 
+concurrency:
+  group: terraform
+  cancel-in-progress: true
+
 permissions:
   contents: read
   pull-requests: write