Add support for hirsute(Ubuntu21.04)

Author: surbhat1595

packaging/deb-in/CMakeLists.txt

@@ -96,6 +96,8 @@ ELSEIF(DEB_CODENAME STREQUAL "groovy")
   SET (DEB_PLATFORMRELEASE "ubuntu20.10")
 ELSEIF(DEB_CODENAME STREQUAL "focal")
   SET (DEB_PLATFORMRELEASE "ubuntu20.04")
+ELSEIF(DEB_CODENAME STREQUAL "hirsute")
+  SET (DEB_PLATFORMRELEASE "ubuntu21.04")
 ELSE()
   MESSAGE(STATUS
     "Skipping deb packaging on unsupported platform ${DEB_CODENAME}.")