Changes are compared against incorrect branch about paths-filter

[aldenquimby]

@ramandatascientist is the Long lived branches example from the README what you are looking for? That would need this config:

    - uses: dorny/paths-filter@v2
      id: pathfilter
      with:
        base: ${{ github.ref }}
        filters: |
            collector: 'collector/build/**'
            datastore: 'datastore/**'
            refinery: 'refinery/**'