feature request - change problem matcher variable to be relative to checkout-dir.

[bnayah]

I have a monorepo of terraform modules.

Basic structure is as follows:

git root/
.github/
.githuh/worksflows/*.yml
.github/matchers.json
aws/accounts/prod/us-east-1/
aws/modules/vpc
aws/organizations

Each 'account' folder is run by a separate github action, and has a separate state.

The issue is when using problem matchers.
The code assumes that the working directory is at the root of the checkout folder.

Since this is not the case in my flow, the matchers.json is not found.

Action should support variable 'working_directory' to enable module inspection.
Currently I Change directory to the target directory, however the matchers.json directory needs to be relative to the root of the checkout, not the current directory.

[bendrucker]

The matcher file being added is this, you should not be supplying your own:

https://github.com/terraform-linters/setup-tflint/blob/master/.github/matchers.json

__dirname is the correct path, relative to the calling script. If you want to discuss further, we need an example of your workflow.