Add label for which services support docker containers

[zackees]

A docker container is the ultimate way to get a service up and running. Simply enter the open source github repository on DigitalOcean/Render.com and a few minutes later you have your own service with a URL.

It's so simple it's literally a "no-code" solution to app deployment.

It would be nice if any of the listed services can be labeled if they support a docker container.

[woshichenghaibo]

custom domain name first