add env testing prototype

prototyping/env_var_subprocess.py

@@ -0,0 +1,17 @@
+import os
+import subprocess
+
+# Set an environment variable in the parent process
+os.environ["PARENT_VARIABLE"] = "12345s"
+
+# Spawn a subprocess and modify the environment variable
+subprocess.run(
+    [
+        "python",
+        "-c",
+        "import os; print('b', os.environ['PARENT_VARIABLE']); os.environ['PARENT_VARIABLE'] = 'modified_value'; print('c', os.environ['PARENT_VARIABLE'])",
+    ]
+)
+
+# Check if the modification in the subprocess affected the parent process
+print("a", os.environ["PARENT_VARIABLE"])  # This will print 'parent_value', not 'modified_value'