I don’t know why projects set up the compose file to build the image when they already have a publicly available image to use

Because the compose that’s in the repository is the development compose, it’s not meant for users… literally the first line: https://github.com/iv-org/invidious/blob/master/docker-compose.yml#L1

TheFrenchGhosty ( https://invidious.io/team/ )

Nothing exist if you want to use FIAT.

Docker Compose as is.

I used Portainer for like 2 years when I first learned Docker (I only used to deploy compose file and motoring the container), but it’s really shit when you know how it works.