./build/bin/pluginctl deploy com.coltonshaw.additional-banner dist/com.coltonshaw.additional-banner-1.5.1.tar.gz
2022/01/25 15:43:36 Connecting using local mode over /var/tmp/mattermost_local.socket
2022/01/25 15:43:36 Uploading plugin via API.
Failed: failed to upload plugin bundle: : Plugins and/or plugin uploads have been disabled.,
Summary
Plugin uploads are not enabled by default