nx-webmail: switch Umbrel app to prebuilt GHCR image

nx-webmail/umbrel-app.yml

@@ -4,7 +4,7 @@ name: Webmail
 tagline: Self-hosted IMAP/SMTP webmail client
 icon: logo.svg
 category: utilities
-version: "1.0.0"
+version: "1.0.1"
 port: 3001
 description: >-
   Webmail is a lightweight, self-hosted webmail app for connecting to external
@@ -17,7 +17,7 @@ repo: https://git.weektab.org/nexus/webmail
 support: https://git.weektab.org/nexus/webmail/issues
 gallery: []
 releaseNotes: >-
-  Initial Umbrel app packaging.
+  Switched to a prebuilt container image for more reliable Umbrel installs.
 dependencies: []
 path: ""
 defaultUsername: ""