Jesse KarmaniI wrote up a blog post outlining the steps I took to migrate a custom Mastodon fork from heroku to fly.io:
https://jesseplusplus.com/blog/migrating-mastodon-fork-heroku-fly/
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.