Describe the bug
The megalinter does not seem to respect the LINTER_RULES_PATH in the megalint config.

To Reproduce
Add LINTER_RULES_PATH in the configuration file.

1. Place .cspell.json in LINTER_RULES_PATH
2. Run lint
3. Add a misspelled word caught by lint to .cspell jon
4. Run lint

Expected behavior
The linter should no longer flag the misspelled word.

I can move the exact same .cspell.json to the local repository, and it works as expected. So the problem is not in the config gile.

I would also like to use $HOME to set the path, but that does not seem to work either.