Update Pull Request adds a comment to the pull request with the results of the format, init and plan steps. In addition, it displays the plan output (steps.plan.outputs.stdout). This allows your team to review the results of the plan directly in the PR. Based on https://learn.hashicorp.com/tutorials/terraform/github-actions

Terraform_Update_Pull_Request.yaml

- uses: hashicorp/setup-terraform@v1
- name: Update Pull Request
  uses: actions/[email protected]
  if: github.event_name == 'pull_request'
  env:
    PLAN: "${{ steps.plan.outputs.stdout }}"
  with:
    github-token: ${{ secrets.GITHUB_TOKEN }}
    script: |
      const output = `
      Pusher: @${{ github.actor }}, Action: \`${{ github.event_name }}\`
      #### Terraform Format and Style 🖌\`${{ steps.fmt.outcome }}\`
      #### Terraform Initialization ⚙️\`${{ steps.init.outcome }}\`
      #### Terraform Plan 📖\`${{ steps.plan.outcome }}\`
      <details><summary>Show Plan</summary>
      \n
      \`\`\`terraform
      ${process.env.PLAN}
      \`\`\`
      \n
      </details>
      `;

      github.issues.createComment({
        issue_number: context.issue.number,
        owner: context.repo.owner,
        repo: context.repo.repo,
        body: output
      })