Actions: Cancel workflow when new commits are pushed

cancel-in-progress.yml

name: CI with in-progress cancellations

on:
  pull_request:
    branches: [ main ]
  workflow_dispatch:

# This is what will cancel the workflow
concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - name: Print concurrency group
        run: echo '${{ github.workflow }}-${{ github.ref }}'
      - name: Sleep 15s
        run: sleep 15s

From: https://github.com/philip-gai/philip-gai/blob/main/.github/workflows/cancel-in-progress.yml

See docs: https://docs.github.com/en/actions/using-jobs/using-concurrency#example-only-cancel-in-progress-jobs-or-runs-for-the-current-workflow