Update supabase.yaml with variables that enable Supabase external OAu…

[gionatamettifogo]

It is a little bit complicated to enable Github or Google external logins w/o understanding the details of how Coolify and docker compose work. I added some variables that hopefully will help people understand how to enable these providers.

Also, normally the application or service you write sits on an url which is different from the one used by Supabase. In that case the authentication breaks because Supabase GoTrue (the auth provider) was pointing GOTRUE_SITE_URL to the Supabase service instead of the customer's application. So I fixed that and explained a bit.

[andrasbacsai]

Making - GOTRUE_SITE_URL=${GOTRUE_SITE_URL} instead of - GOTRUE_SITE_URL=${SERVICE_FQDN_SUPABASEKONG} makes the GOTRUE_SITE_URL to be empty by default.

Why it cannot be SERVICE_FQDN_SUPABASEKONG which is generated by Coolify?

[tonven]

Making - GOTRUE_SITE_URL=${GOTRUE_SITE_URL} instead of - GOTRUE_SITE_URL=${SERVICE_FQDN_SUPABASEKONG} makes the GOTRUE_SITE_URL to be empty by default.

Why it cannot be SERVICE_FQDN_SUPABASEKONG which is generated by Coolify?

Correct we if I am wrong, but when you, for example, send password recovery from Supabase, GOTRUE_SITE_URL will be used as a redirect url that will be a part of recovery url. And in a case of SERVICE_FQDN_SUPABASEKONG it will just redirect to supabase instance instead of for example nextjs website. Maybe it is better to have something like this:

• GOTRUE_SITE_URL=${GOTRUE_SITE_URL: SERVICE_FQDN_SUPABASEKONG}

Thank you.

[tonven]

@andrasbacsai Also a question not related to variables, but more to supabase.
When I start stack again after first time I get exited state on minio createbucket with this in log: 086161794Z mc: Unable to make bucket supabase-minio/stub. Your previous request to create the named bucket succeeded and you already own it.

I guess it fails because it already created it and we need to check if it existed before creating. If yes, it should be healthy or excluded from healthcheck. I can try to create pr if you can suggest what should we do in this situation.