fixed schema patter for iam_bindings_additive roles (#3258)

* fixed schema to allow iam_bindings_additive roles with "." (roles/compute.admin)

fast/stages/2-project-factory/schemas/project.schema.md

@@ -173,7 +173,7 @@
     - **member**: *string*
       <br>*pattern: ^(?:domain:|group:|serviceAccount:|user:|principal:|principalSet:|[a-z])*
     - **role**: *string*
-      <br>*pattern: ^[a-zA-Z0-9_/]+$*
+      <br>*pattern: ^[a-zA-Z0-9_/.]+$*
     - **condition**: *object*
       <br>*additional properties: false*
       - ⁺**expression**: *string*