[MM-53454] Add export file settings + slash command for public link (#23915)

Co-authored-by: Mattermost Build <build@mattermost.com>

server/cmd/mmctl/docs/mmctl_export.rst

@@ -40,6 +40,7 @@ SEE ALSO
 * `mmctl export create <mmctl_export_create.rst>`_ 	 - Create export file
 * `mmctl export delete <mmctl_export_delete.rst>`_ 	 - Delete export file
 * `mmctl export download <mmctl_export_download.rst>`_ 	 - Download export files
+* `mmctl export generate-presigned-url <mmctl_export_generate-presigned-url.rst>`_ 	 - Generate a presigned url for an export file. This is helpful when an export is big and might have trouble downloading from the Mattermost server.
 * `mmctl export job <mmctl_export_job.rst>`_ 	 - List, show and cancel export jobs
 * `mmctl export list <mmctl_export_list.rst>`_ 	 - List export files
 

server/cmd/mmctl/docs/mmctl_export_generate-presigned-url.rst

@@ -0,0 +1,44 @@
+.. _mmctl_export_generate-presigned-url:
+
+mmctl export generate-presigned-url
+-----------------------------------
+
+Generate a presigned url for an export file. This is helpful when an export is big and might have trouble downloading from the Mattermost server.
+
+Synopsis
+~~~~~~~~
+
+
+Generate a presigned url for an export file. This is helpful when an export is big and might have trouble downloading from the Mattermost server.
+
+::
+
+  mmctl export generate-presigned-url [exportname] [flags]
+
+Options
+~~~~~~~
+
+::
+
+  -h, --help   help for generate-presigned-url
+
+Options inherited from parent commands
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
+
+      --config string                path to the configuration file (default "$XDG_CONFIG_HOME/mmctl/config")
+      --disable-pager                disables paged output
+      --insecure-sha1-intermediate   allows to use insecure TLS protocols, such as SHA-1
+      --insecure-tls-version         allows to use TLS versions 1.0 and 1.1
+      --json                         the output format will be in json format
+      --local                        allows communicating with the server through a unix socket
+      --quiet                        prevent mmctl to generate output for the commands
+      --strict                       will only run commands if the mmctl version matches the server one
+      --suppress-warnings            disables printing warning messages
+
+SEE ALSO
+~~~~~~~~
+
+* `mmctl export <mmctl_export.rst>`_ 	 - Management of exports
+