Add AWS Terraform CI/CD composite GitHub Action

[Copilot]

• Identify cause: ${{ secrets.GITHUB_TOKEN }} in input description string parsed as expression by GitHub Actions runner
• Remove ${{ }} expression syntax from github_token input description in action.yml
• Update README table entry to match

Original prompt

I want this repo to have a public github action in which one can do complete CI(fmt, validate, lint, docs, etc) and CD(plan and deploy) to AWS.