build_python_runtime.yml

name: Build and upload Python runtime
run-name: "Build and upload Python ${{ inputs.python_version }}${{ inputs.dry_run && ' (dry run)' || '' }}"

on:
  workflow_dispatch:
    inputs:
      python_version:
        description: "The Python version to build, specified as X.Y.Z"
        type: string
        required: true
      dry_run:
        description: "Skip deploying to S3 (e.g. for testing)"
        type: boolean
        default: false
        required: false

permissions:
  contents: read

env:
  AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
  AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
  AWS_DEFAULT_REGION: "us-east-1"
  S3_BUCKET: "heroku-buildpack-python"

# Unfortunately these jobs cannot be easily written as a matrix since `matrix.exclude` does not
# support expression syntax, and the `inputs` context is not available inside the job `if` key.
jobs:
  heroku-20:
    runs-on: pub-hk-ubuntu-22.04-xlarge
    env:
      STACK_VERSION: "20"
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      - name: Build Docker image
        run: docker build --platform="linux/amd64" --pull --tag buildenv --build-arg=STACK_VERSION builds/
      - name: Build and package Python runtime
        run: docker run --rm --volume="${PWD}/upload:/tmp/upload" buildenv ./build_python_runtime.sh "${{ inputs.python_version }}"
      - name: Upload Python runtime archive to S3
        if: (!inputs.dry_run)
        run: aws s3 sync ./upload "s3://${S3_BUCKET}"

  heroku-22:
    # On Heroku-22 we only support Python 3.9+.
    if: (!startsWith(inputs.python_version,'3.8.'))
    runs-on: pub-hk-ubuntu-22.04-xlarge
    env:
      STACK_VERSION: "22"
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      - name: Build Docker image
        run: docker build --platform="linux/amd64" --pull --tag buildenv --build-arg=STACK_VERSION builds/
      - name: Build and package Python runtime
        run: docker run --rm --volume="${PWD}/upload:/tmp/upload" buildenv ./build_python_runtime.sh "${{ inputs.python_version }}"
      - name: Upload Python runtime archive to S3
        if: (!inputs.dry_run)
        run: aws s3 sync ./upload "s3://${S3_BUCKET}"