SUPPORT: Define support lifetime

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Roger Pau Monné <roger@xenproject.org>
Release-Acked-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>

SUPPORT.md

@@ -9,13 +9,13 @@ for the definitions of the support status levels etc.
 
 # Release Support
 
-    Xen-Version: 4.22-rc
-    Initial-Release: n/a
-    Supported-Until: TBD
-    Security-Support-Until: Unreleased - not yet security-supported
+    Xen-Version: 4.22
+    Initial-Release: 2026-07-30
+    Supported-Until: 2029-07-30
+    Security-Support-Until: 2031-07-30
 
 Release Notes
-: <a href="https://wiki.xenproject.org/wiki/Xen_Project_X.YY_Release_Notes">RN</a>
+: <a href="https://wiki.xenproject.org/wiki/Xen_Project_4.22_Release_Notes">RN</a>
 
 # Feature Support