jackett for heroku also can be installed on other server.

As you know docker on railyway.app or heroku will if restart used data from repo --
So if you will make change add configuration on your app - When it will restart it will purge your data to over the issue..
I deployed this jackett (server.io) docker version on localhost - added configuration and created all file so it will work for you out of the box.
Admin password is admin -- Cloudflare FlareSolver is confgured it should work out of the box. \

Deoply on Heroku

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Deploy using CLI

• Clone the repo
• Install Heroku CLI

git clone https://github.com/amjiddader/Jackett
cd Jackett
heroku login
heroku apps:create APP
heroku stack:set container
git push heroku main --force

Deploy on localhost

docker run -d --name=jackett -e PUID=1000 -e PGID=1000-e -p 9117:9117 -v /config:/config -v /config:/downloads --restart unless-stopped lscr.io/linuxserver/jackett