The question at "Why is one not allowed to use a Boolean in a docker-compose.yml?" is about docker-compose but there is not such a tag.
You can do it yourself—simply type docker-compose into the tag entry box, and it will be created.
In private beta, creating tags only requires 1 reputation point. When we leave private beta and the privilege levels increase, it should be sufficient to leave a little notice at the end of the post asking for the tag to be added (or perhaps leave a comment).
In public beta, 150 reputation will be required, and after graduation, 300 rep is required (see Reputation requirements compared on Meta.SE).
Oh normally at least 300 rep is required right?– 030Mar 16, 2017 at 17:30
@030: Yes, it will be 150 reputation in public beta, and 300 past graduation. Mar 16, 2017 at 17:32