GitHub Action: preview-environment-controller

Action to manage to deploy and purge preview environments depends on PR labels

Introduction

Testing Pull Request changes usually lead to having it deployed on a preview environment. The environment can be ephemeral or pre-provisioned. In the last case, there is a countable number of preview environments. This GitHub Action follows a pattern when the developer set PR label to specify a preview environment to deploy. github-action-preview-environment-controller allow to define map of environment => label. Depending on current PR labels the action outputs a list of deploy and destroy environments. So it performs a controller role and does not limit deployment methods or tools.

Usage

Use github-action-preview-environment-controller in Pull Request triggered pipeline, and use it's outputs to determinate what environments should be deployed and what cleaned up.

  name: github-action-preview-environment-controller
  on:
    pull_request:
      branches: [ 'main' ]
      types: [opened, synchronize, reopened, closed, labeled, unlabeled]

  jobs:
    context:
      runs-on: ubuntu-latest
      steps:
        - name: github-action-preview-environment-controller
          uses: cloudposse/github-action-preview-environment-controller@main
          id: controller
          with:
            labels: ${{ toJSON(github.event.pull_request.labels.*.name) }}
            open: ${{ github.event.pull_request.state == 'open' }}
            env-label: |
              preview: deploy
              qa1: deploy/qa1
              qa2: deploy/qa2

      outputs:
        labels_env: ${{ steps.controller.outputs.labels_env }}
        deploy_envs: ${{ steps.controller.outputs.deploy_envs }}
        destroy_envs: ${{ steps.controller.outputs.destroy_envs }}

    deploy:
      runs-on: ubuntu-latest
      if: ${{ needs.context.outputs.deploy_envs != '[]'  }}
      strategy:
        matrix:
          env: ${{ fromJson(needs.context.outputs.deploy_envs) }}
      environment:
        name: github-action-preview-environment-controller
      needs: [ context ]
      steps:
        - name: github-action-preview-environment-controller
          uses: example/deploy@main
          id: deploy
          with:
            environment: ${{ matrix.env }}
            operation: deploy

    destroy:
      runs-on: ubuntu-latest
      if: ${{ needs.context.outputs.destroy_envs != '[]'  }}
      strategy:
        matrix:
          env: ${{ fromJson(needs.context.outputs.destroy_envs) }}
      needs: [ context ]
      steps:
        - name: github-action-preview-environment-controller
          uses: example/deploy@main
          id: deploy
          with:
            environment: ${{ matrix.env }}
            operation: destroy

Inputs

Name	Description	Default	Required
env-label	YAML formatted {environment}: {label} map	preview: deploy	true
labels	Existing PR labels	[]	true
open	Is PR open?	true	true

Outputs

Name	Description
deploy_envs	Environments that need to be deployed
destroy_envs	Environments that need to be destroyed
labels_env	JSON formatted {label}: {environment} map