Root from devcontainer dir

[erichlf]

The main portion of this PR changes from using a git command to find the root of the devcontainer to a pure lua function that searches for the devcontainer closest to the root directory, i.e. /. The toplevel flag determines if we use the closest or furthest up the direcotry tree result.

• Use lua to find uppermost devctontainer
• Add option to find toplevel or nearest
• Separated the logic for running the devcontainer from the window creation.
• Added the ability to cancel bringing up the devcontainer.
• Updated devcontainer.json and Dockerfile to work more generally.
• Removed some multiply defined behaviors
• Add ability to close window with q or escape
• Added on_detach function to handle setting prev_win, win, and buf to -1 after the window is closed
• Use lua to run commands rather than calling a script

fixes: #27

[erichlf]

I'll add an option for interactive mode, since that is probably why the pipeline is failing.

[erichlf]

I just realized, that I spent so much time on this that I forgot some details. Let this be a draft for the moment as I need to finish up the portion where ndc knows it is running.

[erichlf]

The up job is failing because the bind mounts don't have the files that they are binding to.

[erichlf]

Okay, it is ready for review.

[erichlf]

The latest failures were very strange. It seemed as though the neovim shipped with Ubuntu 20.04 (neovim 0.4) didn't have os.getenv, but you had this working before, so I am confused by that. Anyway, I updated to 22.04 and then fixed the folder tests to be in line with the newer functions.

[arnaupv]

The latest failures were very strange. It seemed as though the neovim shipped with Ubuntu 20.04 (neovim 0.4) didn't have os.getenv, but you had this working before, so I am confused by that. Anyway, I updated to 22.04 and then fixed the folder tests to be in line with the newer functions.

This might be releated to installing nvim in the devcontainer instead of installing using the setup-environment command.