feat: added variables in the root module to allow passing in pre and …

[jaydenrasmussen]

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Issue Endorsed by Maintainers

Description of the Change

Added two variables to the root module userdata_preinstall and userdata_postinstall which will allow end-users to pass in extraneous scripts to their runners to install dependencies, and other software needed for their GitHub Actions workflows.

Alternate Designs

The variables were already present in the runners module, just not consumed by the root module. This has been updated to allow it to be passed down to that module. There isn't really an alternative to this pattern in terraform.

Possible Drawbacks

Yet another variable to add into the module (more documentation).

Verification Process

Verified by deploying with Terraform into a shared environment for actions runners.

Release Notes

• Allows userdata to be passed into the instance before and after the GitHub Actions Runner is installed.

[npalm]

@jaydenrasmussen thanks for catching those missing paramters. I have update the readme. We use pre-commit to auto update the readme. But seems missing in the instruction.