deploy.yml

# Deploys one commit's image and frontend build to an environment (aws-deployment tickets 07 and
# 08), as two jobs side by side: the backend applies the main configuration, which points both
# functions at the image's digest, and runs one build; the frontend publishes outside data/. Both
# start together, so one approval of a protected environment releases both. Called by pipeline.yml.
#
# Neither waits for the other, so for the minute or so a contract bump takes to land, pages say
# the data and interface are out of step (PRD §7.3) until the other job finishes.
name: deploy

on:
  workflow_call:
    inputs:
      environment:
        description: dev or prod; picks the GitHub environment, CI role, workspace and tfvars.
        type: string
        required: true
      image_uri:
        description: The image by digest, as push-image.sh printed it.
        type: string
        required: true

permissions:
  contents: read

env:
  AWS_REGION: ap-southeast-1
  ENVIRONMENT: ${{ inputs.environment }}
  CI_ROLE: arn:aws:iam::132218943709:role/github-actions-interface-${{ inputs.environment }}

jobs:
  backend:
    runs-on: ubuntu-26.04
    environment: ${{ inputs.environment }}
    # One deploy per environment at a time; a newer one waits rather than cancelling one half done.
    concurrency:
      group: deploy-${{ inputs.environment }}-backend
      cancel-in-progress: false
    permissions:
      contents: read
      id-token: write
    env:
      IMAGE_URI: ${{ inputs.image_uri }}
      TF_IN_AUTOMATION: "1"
      # Selected before init: each CI role can reach only its own environment's state.
      TF_WORKSPACE: ${{ inputs.environment }}
    steps:
      - uses: actions/checkout@v7
      - uses: aws-actions/configure-aws-credentials@v6
        with:
          role-to-assume: ${{ env.CI_ROLE }}
          aws-region: ${{ env.AWS_REGION }}
      - uses: hashicorp/setup-terraform@v4
        with:
          terraform_version: "v1.17.0"
          terraform_wrapper: false

      - name: terraform apply
        id: terraform
        working-directory: infra/main
        run: |
          terraform init -input=false
          terraform apply -input=false -auto-approve -var-file="$ENVIRONMENT.tfvars" -var "image_uri=$IMAGE_URI"
          {
            echo "build_function=$(terraform output -raw build_function)"
            echo "extract_function=$(terraform output -raw extract_function)"
          } >> "$GITHUB_OUTPUT"
          {
            echo "Deployed \`$IMAGE_URI\` to $ENVIRONMENT"
            echo "- $(terraform output -raw site_url)"
            echo "- https://$(terraform output -raw distribution_domain)"
          } >> "$GITHUB_STEP_SUMMARY"

      # A build on the new image, so the data is built to its contract version.
      - name: Build the data
        env:
          BUILD_FUNCTION: ${{ steps.terraform.outputs.build_function }}
          EXTRACT_FUNCTION: ${{ steps.terraform.outputs.extract_function }}
        run: |
          for function in "$BUILD_FUNCTION" "$EXTRACT_FUNCTION"; do
            aws lambda wait function-updated-v2 --function-name "$function"
          done
          error="$(aws lambda invoke --function-name "$BUILD_FUNCTION" \
            --cli-read-timeout 0 --query FunctionError --output text build.json)"
          cat build.json; echo
          if [ "$error" != "None" ]; then echo "the build failed: $error" >&2; exit 1; fi

  frontend:
    runs-on: ubuntu-26.04
    environment: ${{ inputs.environment }}
    concurrency:
      group: deploy-${{ inputs.environment }}-frontend
      cancel-in-progress: false
    permissions:
      contents: read
      id-token: write
    env:
      # Named by the admin configuration (infra/admin, ADR 0005), so no terraform is needed here.
      SITE_BUCKET: snacker-tracker-${{ inputs.environment }}-site
    steps:
      - uses: actions/checkout@v7
      - uses: aws-actions/configure-aws-credentials@v6
        with:
          role-to-assume: ${{ env.CI_ROLE }}
          aws-region: ${{ env.AWS_REGION }}
      - uses: actions/download-artifact@v8
        with:
          name: frontend-${{ github.sha }}
          path: frontend/dist
      - name: Publish the frontend
        run: frontend/scripts/sync-site.sh "$SITE_BUCKET"