Add support for running with Docker #3
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This will be needed in an upcoming change, where I do some initial work before running the actual command.
The need for this is subtle: For CTSM, the documentation build invokes 'git lfs pull'. However, when doing the documentation build from a git worktree, the .git directory is replaced with a text file giving the absolute path to the parent git repository, e.g., 'gitdir: /Users/sacks/ctsm/ctsm0/.git/worktrees/ctsm5'. So when trying to execute a git command from within the Docker image, you get a message like, 'fatal: not a git repository: /Users/sacks/ctsm/ctsm0/.git/worktrees/ctsm5', because in Docker-land, this path doesn't exist. To work around this problem, we create a sym link in Docker's file system with the appropriate mapping. For example, if the local file system's mount-point is /path/to/foo, then we create a sym link at /path/to/foo in Docker's file system, pointing to the home directory in the Docker file system.
This is needed for output to be colorful
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Add ability to use a Docker image to do the documentation build.
For now, this assumes the use of the escomp/base docker image.
(I'm opening this PR for documentation purposes; it doesn't require review, and I'll merge it myself.)