Running GitHub Actions on an AWS ECR image

action_in_ecr_container.yaml

name: Run tests

on:
  push:
    branches:
      - 'main'

jobs:
  ecr_login:
    runs-on: ubuntu-latest
    outputs:
      ecr_password: ${{ steps.retrieve_password.outputs.ecr_password }}
    steps:
      - name: Set up AWS CLI
        uses: chrislennon/action-aws-cli@1.1
      - id: retrieve_password
        name: Retrieve ECR password and store as secret
        env:
          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
          AWS_DEFAULT_REGION: us-west-2
        run: echo "::set-output name=ecr_password::$(aws ecr get-login-password)"

  test:
    needs: ecr_login
    runs-on: ubuntu-latest
    container:
      image: ACCOUNT_ID.dkr.ecr.REGION.amazonaws.com/IMAGE:TAG
      credentials:
        username: AWS
        password: ${{ needs.ecr_login.outputs.ecr_password }}
    steps:
      - run: echo "Running my tests inside a container pulled from ECR \o/"