feat: auto-generate terraform docs on .tf file changes

[Copilot]

Terraform module READMEs were only updated via pre-commit hooks locally, with no CI enforcement or automation on push/PR.

Changes

• New workflow .github/workflows/terraform-docs.yml:
  • Triggers on pull_request and push to main scoped to **/*.tf path changes
  • Runs terraform-docs/gh-actions@v1 in recursive mode across the entire repo
  • Uses inject output method — updates only <!-- BEGIN_TF_DOCS -->…<!-- END_TF_DOCS --> blocks, preserving surrounding custom content
  • Passes --lockfile=false to match existing pre-commit configuration
  • Auto-commits and pushes updated README.md files back to the branch as github-actions[bot]
  • Minimal permissions: contents: write + pull-requests: write at job scope only, consistent with other workflows in the repo

Original prompt

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This section details on the original issue you should resolve

<issue_title>implement auto tfdocs on changes</issue_title>
<issue_description>Is your feature request related to a problem? Please describe.
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</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes implement auto tfdocs on changes #89

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