add auth functionality

policies/testdata/principals.yaml

@@ -0,0 +1,19 @@
+# yaml-language-server: $schema=https://api.cerbos.dev/latest/cerbos/policy/v1/TestFixture/Principals.schema.json
+# docs: https://docs.cerbos.dev/cerbos/latest/policies/compile#_sharing_test_fixtures
+
+principals:
+  user#1:
+    id: user#1
+    roles:
+      - user
+    attr: {}
+  admin#2:
+    id: admin#2
+    roles:
+      - admin
+    attr: {}
+  thirdParty#3:
+    id: thirdParty#3
+    roles:
+      - thirdParty
+    attr: {}