omnibus/cli: only match override value against regex for strings

As of Ruby 3.2, `true =~ /regex/` raises an exception (a NoMethodError
for `=~`) instead of returning `nil` (seen in 3.1 and earlier),
so using `--override key:true` (and false / nil) fails with an
error. Instead of always comparing value against a regular expression,
only do it if the value didn't match a known true/false/nil value.

This appears to stem from <https://bugs.ruby-lang.org/issues/15231>.

Signed-off-by: Noel Cower <[email protected]>

Author: nilium

lib/omnibus/cli/base.rb

@@ -69,9 +69,7 @@ def initialize(args, options, config)
         if %w{true false nil}.include?(value)
           log.debug(log_key) { "Detected #{value.inspect} should be an object" }
           value = { "true" => true, "false" => false, "nil" => nil }[value]
-        end
-
-        if value =~ /\A[[:digit:]]+\Z/
+        elsif value =~ /\A[[:digit:]]+\Z/
           log.debug(log_key) { "Detected #{value.inspect} should be an integer" }
           value = value.to_i
         end