Disable update command on Docker

CHANGELOG.md

@@ -16,6 +16,7 @@ however, insignificant breaking changes do not guarantee a major version bump, s
 ### Fixed
 
 - Thread auto close now checks for `thread_auto_close` config before actually closing the ticket. [(#3290)](https://github.com/modmail-dev/Modmail/issues/3290)
+- Update command on Docker platform has been disabled. [(OpenModmail#76304f1)](https://github.com/khakers/OpenModmail/commit/76304f19553fe086ac79beab222c23fb224c88c9)
 
 # v4.3.1
 

cogs/utility.py

@@ -1989,6 +1989,16 @@ async def update(self, ctx, *, flag: str = ""):
         To stay up-to-date with the latest commit from GitHub, specify "force" as the flag.
         """
 
+        if self.bot.hosting_method == HostingMethod.DOCKER:
+            return await ctx.send(
+                embed=discord.Embed(
+                    title="This command is not supported on Docker",
+                    description="You can update your bot by pulling the latest image from the registry:"
+                    "\n`docker pull ghcr.io/raidensakura/modmail:stable`",
+                    color=self.bot.error_color,
+                )
+            )
+
         changelog = await Changelog.from_url(self.bot)
         latest = changelog.latest_version