prevent duplicate license includes

Author: rfbgo

var/ramble/repos/builtin/base_classes/application-base/base_class.py

@@ -3297,6 +3297,7 @@ def env_vars(self):
 
         action_funcs = ramble.util.env.action_funcs
 
+        license_set = set()
         for scope in config_scopes:
             license_conf = ramble.config.config.get_config(
                 "licenses", scope=scope
@@ -3307,10 +3308,12 @@ def env_vars(self):
                     if app_licenses:
                         # Append logic to source file which contains the exports
                         shell = ramble.config.get("config:shell")
-                        command.append(
+                        license_set.add(
                             f"{source_str(shell)} {{license_input_dir}}/{constants.LICENSE_INC_NAME}"
                         )
 
+        command.append(license_set)
+
         # Process environment variable actions
         for env_var_set in self.environment_variable_sets:
             for action, conf in env_var_set.items():