Github Actions Teardown Serverless Stack - Empty S3 Buckets

s3BucketCleaner.yml

name: TeardownBranch

'on': [delete]

jobs:
  build:
    runs-on: ubuntu-latest

    strategy:
      matrix:
        region: [ap-southeast-2]

    steps:
      - name: Set the branch name as id so we can use it for named stack reference
        run: echo "::set-output name=BRANCH_NAME::$(echo ${{github.event.ref}} | sed 's/\//_/g' | sed 's/.*_//' | tr '[:upper:]' '[:lower:]')"
        id: set_branch_name_var

      - name: Assume Role
        if: github.ref != 'refs/heads/master'
        uses: aws-actions/configure-aws-credentials@v1
        with:
          role-session-name: RoleSessionName
          role-duration-seconds: 900
          aws-region: '${{ matrix.region }}'
          role-to-assume: '${{ secrets.AWS_ROLE }}'
          aws-access-key-id: '${{ secrets.AWS_ACCESS_KEY_ID }}'
          aws-secret-access-key: '${{ secrets.AWS_SECRET_ACCESS_KEY }}'

      - uses: actions/checkout@v1

      - name: Serverless Teardown
        if: github.event.ref_type == 'branch'
        run: |
          cd Serverless
          npm install

          echo "Removing contents of all S3 buckets..."

          for bucket in $(aws cloudformation describe-stack-resources
          --stack-name ${{steps.set_branch_name_var.outputs.BRANCH_NAME }} --query
          'StackResources[?(ResourceType==`AWS::S3::Bucket` &&
          LogicalResourceId!=`ServerlessDeploymentBucket`)].PhysicalResourceId'
          --output text); do echo aws s3 rm s3://$bucket --recursive; done;

          echo "S3 bucket contents have been removed"

          echo "Starting deletion of stack"
          npx serverless remove -s ${{steps.set_branch_name_var.outputs.BRANCH_NAME }} -r ${{ matrix.region }}