A sample GitHub workflow using paths filters that can be referenced on the step and job level (e.g. to skip a job if there were no related code changes)

ci-with-path-filter.yml

jobs:
  changes:
    runs-on: ubuntu-latest
    name: Check changes
    outputs:
      functions: ${{ steps.filter.outputs.functions }}
    steps:
      - uses: actions/checkout@v3
        name: Checkout project to determine changed files
        with:
          fetch-depth: 50
      - uses: dorny/paths-filter@v2
        id: filter
        with:
          base: main
          filters: |
            functions:
              - 'functions/**/*'
              - 'package.json'

  functions:
    runs-on: ubuntu-latest
    name: Functions CI
    needs: [changes]
    # run job if there were actual changes
    if: ${{ needs.changes.outputs.functions == 'true' }}
...