Merge pull request #1856 from alphagov/fix-create-pr.yaml-trigger-name

Update the workflow name used to trigger create_pr job

.github/workflows/create-pr.yaml

@@ -3,7 +3,7 @@ name: Create charts PR
 on:
   workflow_dispatch:
   workflow_run:
-    workflows: [ "Build and push images" ]
+    workflows: [ "Build and push multi-arch image" ]
     types:
       - completed