the SIGN_TOKEN enviroment variable is used to sign the urls for images proxied by the server
docker run -p 127.0.0.1:3333:3333 -e SIGN_TOKEN=imagesurlsigntoken minettyx/foolslideproxy
Use in tachiyomi
Install the "FoolSlide Customizable" extension in Tachiyomi (now not official anymore, read this afticle) or use my custom version of the extension that adds covers when searching
Go the the Extensions tab, find the extension and click on "Settings"
Click on the gear icon, change the URL to your server and make sure no leading slash is present (or use my public instance "https://foolslideproxy.minettyx.com"), click OK and restart Tachiyomi (you may need to force stop it from the applications settings)