provision: Add provision support for KDE Neon 20.04.

PostgreSQL 12 is used for Neon 20.04, which is a fork of Ubuntu 20.04.

Author: aditya-mitra

tools/lib/provision.py

@@ -96,6 +96,8 @@
     POSTGRESQL_VERSION = "11"
 elif vendor == "ubuntu" and os_version == "20.04":  # focal
     POSTGRESQL_VERSION = "12"
+elif vendor == "neon" and os_version == "20.04":  # KDE Neon
+    POSTGRESQL_VERSION = "12"
 elif vendor == "fedora" and os_version == "29":
     POSTGRESQL_VERSION = "10"
 elif vendor == "rhel" and os_version.startswith("7."):