(GH-1057) Regex fix to allow dotted resources

Prior to this commit, one of our recent module updates introduced a
regex validation step for the resource names in our ppa.pp manifest
which would raise an issue if a valid resource name contained a dot (.).

This commit aims to slightly adjust the regex validation so that it
allows for dotted resource names. This PR should fix issue #1057.

Author: LukasAud

manifests/ppa.pp

@@ -40,7 +40,7 @@
   }
 
   # Validate the resource name
-  if $name !~ /^ppa:([a-zA-Z0-9\-_]+)\/([a-zA-z0-9\-_]+)$/ {
+  if $name !~ /^ppa:([a-zA-Z0-9\-_]+)\/([a-zA-z0-9\-_\.]+)$/ {
     fail("Invalid PPA name: ${name}")
   }