fix: remove backslash line continuations from YAML multiline string

- YAML block scalars (|) don't use backslash continuation
- Just indent lines properly, block scalar handles them automatically
- Fixes ArgoCD ComparisonError on poimen app

k8s/argocd/apps/70-poimen.yaml

@@ -6,9 +6,9 @@ metadata:
   annotations:
     argocd.argoproj.io/sync-wave: "7"
     # Image Updater: auto-update on new image push (SHA tag filter)
-    argocd-image-updater.argoproj.io/image-list: |\
-      memory=forgejo.riotpiao.com/rock/poimen-memory\
-      workflows=forgejo.riotpiao.com/rock/poimen-workflows\
+    argocd-image-updater.argoproj.io/image-list: |
+      memory=forgejo.riotpiao.com/rock/poimen-memory
+      workflows=forgejo.riotpiao.com/rock/poimen-workflows
       frontend=forgejo.riotpiao.com/rock/poimen-frontend
     argocd-image-updater.argoproj.io/memory.update-strategy: newest-build
     argocd-image-updater.argoproj.io/memory.allow-tags: regexp:^[0-9a-f]{7}$