Distribute the check-jsonschema tool in a manner which does not assume a Python environment #379

For context, see: go-task/task#1476 (comment)

For potential users who are not Python users, it's harder to use the CLI because they need to learn how to setup an environment (pipx, etc). brew solves some of this for us (yay), but it's not enough for all cases.

Think about docker as a way of wrapping it, pyinstaller/etc, other app-zipping solutions, etc.
Also consider a custom GitHub Action as a usage mode.