Support a custom upload command

config/config.toml.example

@@ -19,13 +19,13 @@ branch = "user/nick/updates"
 # be configured consistently with the remote_path.
 download_url = "https://example.com/some/path"
 
-# If a package updater generates a source tarball, the tarball is uploaded to
-# a remote destination with scp. remote_path specifies the remote server and
-# a local path on the server where the source tarballs are hosted. When
-# uploading the remote_path is followed by the package name and source file
-# name. To specify a public URL where the sources can be downloaded, see
-# download_url.
-remote_path = "example.com:/srv/httpd/some/path"
+# If a package updater generates a source tarball, the tarball is uploaded with
+# a command given in this parameter. The parameter is a array where the first
+# element is the command with the following elements being the command
+# arguments. The command supports 2 placeholders:
+# %s - Path to the source archive.
+# %c - Package category.
+upload_command = ["scp", "%s", "example.com:/srv/httpd/some/path/%c"]
 
 ## Maintainer specific options
 [maintainer]