Merge pull request #229 from kenyon/newer-ubuntus

`metadata.json`: add support for Ubuntu 22.04

Author: MartyEwings

metadata.json

@@ -63,7 +63,8 @@
       "operatingsystem": "Ubuntu",
       "operatingsystemrelease": [
         "18.04",
-        "20.04"
+        "20.04",
+        "22.04"
       ]
     },
     {