existing templates are now skipped from packer run

src/packme/Packman.py

@@ -223,9 +223,10 @@ class Packman:
             build_dir = os.path.join(current_template_dir,"builds")
 
             if os.path.exists(build_dir):
-                raise IOError("The 'builds' directory already exists. Please remove it before running packer.")
+                print(f"packer build already found in {current_template_dir}. Skip packer run for that template.")
+                continue
             else:
-                print("Building image for {}:".format(template))
+                print(f"Building image for {template}:")
 
             os.chdir(current_template_dir)