We currently do not support global setup and tear down natively. It is on our roadmap, and we’d love to chat with you about your specific use case. In the meantime, you can trigger Stably tests in Github action and add setup and tear down steps. Here is an example: 
name: Stably Test Runner Example

on:
  pull_request:
  push:
    branches:
      - master
# You need to set these permissions if using the `github-comment` option
permissions:
  pull-requests: write
  contents: write
jobs:
  stably-test-action:
    name: Stably Test Runner
    runs-on: ubuntu-latest

    steps:
      - name: Global Setup
        run: echo "Running global setup tasks"

      - name: Stably Runner Action
        id: stably-runner
        uses: stablyhq/stably-runner-action@v3
        with:
            api-key: ${{ secrets.API_KEY }}
            test-group-id: clsv2qusn000111w9xs23b4uh

      - name: Global Tear Down
        run: echo "Running global tear down tasks"
You will need an API key to trigger Stably from GitHub action. Visit the settings page to find the key