You usually see these on fields that are co-owned or need to be accessed by several municipalities. Everybody gets their own key but can still have access to the area whenever needed.
You can run it from an image without docker-compose but I'd recommend looking into docker-compose if you're not already familiar with it. @CannaVet@lemmy.world has the idea right that it's just a powerful installation file and can automate your docker management process rather well if you're using it a lot.
You can build a container from an image but it's obviously more hands-on. Lemmy may have additional dependencies they include in the compose file that may not be present in the image source. but starting with something like
You usually see these on fields that are co-owned or need to be accessed by several municipalities. Everybody gets their own key but can still have access to the area whenever needed.