ci: add concurrency cancel-in-progress to deploy workflows

Prevents stacked deploys when commits are pushed in quick succession.
A new push cancels the in-flight CI run before it reaches kubectl,
avoiding the window where both the old and new pods are 0/1.

Author: cooper667

.github/workflows/build-deploy.yml

@@ -10,6 +10,10 @@ on:
         required: false
         type: string
 
+concurrency:
+  group: deploy-staging-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   ACR_NAME: adracr
   IMAGE_NAME: ckan

.github/workflows/release-deploy.yml

@@ -17,6 +17,10 @@ on:
         required: true
         type: string
 
+concurrency:
+  group: deploy-production-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   ACR_NAME: adracr
   IMAGE_NAME: ckan