terraform.yml

name: 'Terraform'

on:
  push:
    branches:
    - master
  pull_request:
    branches:
    - master

jobs:
  terraform-plan:
    name: 'Terraform Plan'
    runs-on: ubuntu-latest
    outputs:
      tfplanExitCode: ${{ steps.tf-plan.outputs.exitcode }}

    steps:
    - name: Checkout
      uses: actions/checkout@v4

    - name: Setup Terraform
      uses: hashicorp/setup-terraform@v3
      with:
        terraform_wrapper: false

    - name: Terraform Init
      working-directory: ./tf
      run: terraform init

    - name: Terraform Format
      working-directory: ./tf
      run: terraform fmt -check

    - name: Terraform Plan
      id: tf-plan
      working-directory: ./tf
      run: |
        export exitcode=0
        terraform plan -detailed-exitcode -no-color -out tfplan || export exitcode=$?

        echo "exitcode=$exitcode" >> $GITHUB_OUTPUT

        if [ $exitcode -eq 1 ]; then
          echo Terraform Plan Failed!
          exit 1
        else
          exit 0
        fi

    - name: Publish Terraform Plan
      uses: actions/upload-artifact@v4
      with:
        name: tfplan
        path: tfplan

    - name: Create String Output
      id: tf-plan-string
      working-directory: ./tf
      run: |
        TERRAFORM_PLAN=$(terraform show -no-color tfplan)

        delimiter="$(openssl rand -hex 8)"
        echo "summary<<${delimiter}" >> $GITHUB_OUTPUT
        echo "## Terraform Plan Output" >> $GITHUB_OUTPUT
        echo "<details><summary>Click to expand</summary>" >> $GITHUB_OUTPUT
        echo "" >> $GITHUB_OUTPUT
        echo '```terraform' >> $GITHUB_OUTPUT
        echo "$TERRAFORM_PLAN" >> $GITHUB_OUTPUT
        echo '```' >> $GITHUB_OUTPUT
        echo "</details>" >> $GITHUB_OUTPUT
        echo "${delimiter}" >> $GITHUB_OUTPUT

    - name: Publish Terraform Plan to Task Summary
      env:
        SUMMARY: ${{ steps.tf-plan-string.outputs.summary }}
      run: |
        echo "$SUMMARY" >> $GITHUB_STEP_SUMMARY

    - name: Push Terraform Output to PR
      if: github.ref != 'refs/heads/master'
      uses: actions/github-script@v7
      env:
        SUMMARY: "${{ steps.tf-plan-string.outputs.summary }}"
      with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const body = `${process.env.SUMMARY}`;
            github.rest.issues.createComment({
                issue_number: context.issue.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                body: body
            })

  terraform-apply:
    name: 'Terraform Apply'
    if: github.ref == 'refs/heads/master' && needs.terraform-plan.outputs.tfplanExitCode == 2
    runs-on: ubuntu-latest
    needs: [terraform-plan]

    steps:
    - name: Checkout
      uses: actions/checkout@v4

    - name: Setup Terraform
      uses: hashicorp/setup-terraform@v3

    - name: Terraform Init
      working-directory: ./tf
      run: terraform init

    - name: Download Terraform Plan
      uses: actions/download-artifact@v4
      with:
        name: tfplan

    - name: Terraform Apply
      working-directory: ./tf
      run: terraform apply -auto-approve tfplan