How would I use this? Say I just made a bad commit in my terminal. How would I run this container to fix it? The container doesn't have my working directory does it? Or is that the idea, to mount a volume with the working for or something?

In that case, maybe it could be helpful, but to make it convenient, don't I need a script that stays in my main system and invokes the docker run command for me?

So if you do that and just give me a one liner install command to copy paste then I guess this actually makes sense. A small docker container could eliminate a lot of potential gotchas with trying to install dependencies in arbitrary environments.

Except it's a bash script. I guess it would make more sense to get rid of the dependency on fzf or something nonstandard. Then they can just install your bash script.

For cases where you have more dependencies that really can't be eliminated then this would make more sense to me.

Why does it need fzf? Is it intended to run the container interactively?