chore(github): add code owners for schema/workflows (#27761)

Author: caugner

.github/CODEOWNERS

@@ -1,11 +1,9 @@
-# See GOVERNANCE.md for more about this repository's owners and this project's
-# governance.
+# See GOVERNANCE.md for more about this repository's owners 
+# and this project's governance.
 
-# Schema, linter and infrastructure changes must be reviewed by an owner:
-# ======================================================================
-# /test/    TODO: insert @ handles for owners
-# /schemas/ TODO: insert @ handles for owners
-# /.github/ TODO: insert @ handles for owners
+# Order is important: The last matching pattern takes precedence.
+# For more detailed information, see:
+# https://docs.github.com/en/free-pro-team@latest/github/creating-cloning-and-archiving-repositories/about-code-owners
 
-## This pattern will only match files in the root directory:
-# /*        TODO: insert @ handles for owners
+/schemas/ @mdn/bcd-owners
+/.github/workflows/ @mdn/core-dev