feat: 🎸 add missing array fields to auth method attributes

addons/api/addon/models/auth-method.js

@@ -7,7 +7,7 @@ import { equal } from '@ember/object/computed';
  */
 export const options = {
   oidc: {
-    signing_algorithm: [
+    signing_algorithms: [
       'RS256',
       'RS384',
       'RS512',

addons/api/addon/models/fragment-auth-method-attributes.js

@@ -20,4 +20,21 @@ export default class FragmentAuthMethodAttributesModel extends Fragment {
     emptyArrayIfMissing: true,
   })
   account_claim_maps;
+
+  @fragmentArray('fragment-string', {
+    emptyArrayIfMissing: true,
+  })
+  claims_scopes;
+
+  @fragmentArray('fragment-string', {
+    emptyArrayIfMissing: true,
+  })
+  signing_algorithms;
+
+  @fragmentArray('fragment-string', {
+    emptyArrayIfMissing: true,
+  })
+  allowed_audiences;
+
+  @fragmentArray('fragment-string', { emptyArrayIfMissing: true }) idp_ca_certs;
 }