Deploy terraform config to GCP using GitHub Actions

[BryceBeagle]

• dev
  • On PR open/commit: Deploy to shortcake-dev GCP project (Deploy PRs to shortcake-dev using Terraform Cloud and GitHub Actions #8)
  • Ensure that PRs don't share resources on shortcake-dev GCP project (Keep PR deployment resources isolated #11)
  • On PR close: Destroy deployment on shortcake-dev GCP project (Destroy workspaces on PR close/conversion to draft #14)
  • Prevent concurrent runs (Add concurrency block to prevent two runs at the same time #15)
• staging
  • On commit to main: Deploy to shortcake-staging GCP project (Deploy to staging on commit to main #16)
• prod
  • On release tag: Deploy to shortcake-prod GCP project