terraform/github: add .github repo

Closes: #265 [via git-merge-pr]

Author: classabbyamp

terraform/github/github.tf

@@ -232,6 +232,13 @@ locals {
         "pkg-committers",
       ]
     }
+
+    ".github" = {
+      description = "Default files for the org"
+      teams = [
+        "webmasters",
+      ]
+    }
   }
 }