ci: add CODEOWNERS to route workflow PRs to a reviewer

Assign @ahmed-arb as code owner for .github/workflows/ so workflow and
automated dependency PRs automatically request review.

Author: Abdul-Muqadim-Arbisoft

.github/CODEOWNERS

@@ -0,0 +1,7 @@
+# Code owners for this repository.
+# Listed owners are automatically requested for review when a matching file
+# changes. This also drives reviewer assignment for automated (e.g. Dependabot)
+# workflow PRs.
+# https://docs.github.com/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
+
+/.github/workflows/ @Abdul-Muqadim-Arbisoft