Propagate env file for webapp deployment (#669)

stack_orchestrator/util.py

@@ -18,6 +18,8 @@ import os.path
 import sys
 import ruamel.yaml
 from pathlib import Path
+from dotenv import dotenv_values
+from typing import Mapping
 
 
 def include_exclude_check(s, include, exclude):
@@ -178,3 +180,7 @@ def global_options2(ctx):
 def error_exit(s):
     print(f"ERROR: {s}")
     sys.exit(1)
+
+
+def env_var_map_from_file(file: Path) -> Mapping[str, str]:
+    return dotenv_values(file)