terraform-feature-env.yml

name: Terraform Feature Env

on:
  pull_request:
    types: [reopened, opened, synchronize, edited]

jobs:
  terraform_apply:
    name: Apply
    runs-on: ubuntu-latest
    permissions:
      contents: read
      issues: write
      pull-requests: write
    defaults:
      run:
        working-directory: ./infra
    env:
      PR_NUMBER: ${{ github.event.number }}
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Setup Terraform
        uses: hashicorp/setup-terraform@v1
        with:
          terraform_version: 1.4.6

      # Initialize a new or existing Terraform working directory by creating initial files, loading any remote state, downloading modules, etc.
      - name: Terraform Init
        id: init
        run: terraform init -backend-config backend-config-dev.tfvars
        env:
          GOOGLE_CREDENTIALS: ${{ secrets.GCP_CREDENTIALS_DEV }}

      # Select the relevant Terraform workspace.
      - name: Terraform Select Workspace
        id: select
        run: terraform workspace select -or-create dev-$PR_NUMBER
        env:
          GOOGLE_CREDENTIALS: ${{ secrets.GCP_CREDENTIALS_DEV }}
          PR_NUMBER: ${{ env.PR_NUMBER }}

      # Applies Terraform configuration to the temporary environment
      - name: Terraform Apply
        id: apply
        run: terraform apply -auto-approve -input=false -no-color -lock-timeout=1h -var-file terraform-dev.tfvars -var "credentials=$GOOGLE_CREDENTIALS" -var "env=dev-$PR_NUMBER"
        env:
          GOOGLE_CREDENTIALS: ${{ secrets.GCP_CREDENTIALS_DEV }}
          PR_NUMBER: ${{ env.PR_NUMBER }}

      - name: Terraform Output
        id: output
        run: terraform output -raw leader_node
        env:
          GOOGLE_CREDENTIALS: ${{ secrets.GCP_CREDENTIALS_DEV }}

      - uses: actions/github-script@v6
        if: github.event_name == 'pull_request'
        env:
          APPLY_PLAN: "${{ steps.apply.outputs.stdout }}"
          LEADER_NODE: ${{ steps.output.outputs.stdout }}
          PR_NUMBER: ${{ env.PR_NUMBER }}
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            // 1. Retrieve existing bot comments for the PR
            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
            })
            const botComment = comments.find(comment => {
              return comment.user.type === 'Bot' && comment.body.includes('Terraform Feature Environment')
            })

            // 2. Prepare format of the comment
            const output = `### Terraform Feature Environment (**dev-${process.env.PR_NUMBER}**)
            #### Terraform Initialization ⚙️\`${{ steps.init.outcome }}\`

            #### Terraform Apply \`${{ steps.apply.outcome }}\`

            <details><summary>Show Apply Plan</summary>

            \`\`\`\n
            ${process.env.APPLY_PLAN}
            \`\`\`

            </details>

            *Pusher: @${{ github.actor }}, Action: \`${{ github.event_name }}\`, Working Directory: \`${{ env.tf_actions_working_dir }}\`, Workflow: \`${{ github.workflow }}\`*

            **URL**: \`${process.env.LEADER_NODE}\``;

            // 3. If we have a comment, update it, otherwise create a new one
            if (botComment) {
              github.rest.issues.updateComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: botComment.id,
                body: output
              })
            } else {
              github.rest.issues.createComment({
                issue_number: context.issue.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                body: output
              })
            }