Allow base and ref in PRs to override API behavior

.github/workflows/pull-request-verification.yml

@@ -139,3 +139,24 @@ jobs:
         || steps.filter.outputs.modified_files != 'LICENSE'
         || steps.filter.outputs.deleted_files != 'README.md'
       run: exit 1
+
+  test-baseref-changes:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: ./
+      id: filter
+      with:
+        base: ${{ github.base_ref }}
+        ref: ${{ github.sha }}
+        filters: |
+          error:
+            - not_existing_path/**/*
+          any:
+            - "**/*"
+    - name: filter-test
+      if: steps.filter.outputs.any != 'true' || steps.filter.outputs.error == 'true'
+      run: exit 1
+    - name: changes-test
+      if: contains(fromJSON(steps.filter.outputs.changes), 'error') || !contains(fromJSON(steps.filter.outputs.changes), 'any')
+      run: exit 1