fix(stalwart): Correct permissions to 2000:2000

- Fixed init container to set ownership to 2000:2000
- Stalwart container runs as user 2000 by default
- Resolves permission denied error during web UI setup

Refs: DEV-206

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/stalwart/stalwart-fresh-deployment.yaml

@@ -152,7 +152,7 @@ spec:
       initContainers:
       - name: fix-permissions
         image: busybox:latest
-        command: ["sh", "-c", "chown -R 1000:1000 /var/lib/stalwart && chmod -R 755 /var/lib/stalwart"]
+        command: ["sh", "-c", "chown -R 2000:2000 /var/lib/stalwart && chmod -R 755 /var/lib/stalwart"]
         volumeMounts:
         - name: data
           mountPath: /var/lib/stalwart