TECH-17815 Allow multiple overrides

Author: umarov

lib/kubernetes_template_rendering/cli.rb

@@ -35,8 +35,11 @@ def parse(options)
           op.on("--source-repo=SOURCE_REPO",                   "set the source repo for the rendered templates")                      { args.source_repo = _1 }
 
           op.on("--variable-override=KEY:VALUE", "override a variable value set within definitions.yaml") do |override|
-            args.variable_overrides ||= {}
-            args.variable_overrides.merge!(Hash[[override.split(":", 2)]])
+            args.variable_overrides ||= {} # Initialize as a Hash
+            overrides.each do |override|
+              key, value = override.split(":", 2)
+              args.variable_overrides[key] = value if key && value
+            end
           end
 
           op.on("-h", "--help") do