Use GetProjectOption

Author: ivankravets

builder/main.py

@@ -130,7 +130,7 @@
 
     if build_core == "teensy4":
         # Get the key and default to an empty string
-        custom_secure_key = env.GetProjectConfig().get("env:" + env["PIOENV"], "custom_secure_key", "")
+        custom_secure_key = env.GetProjectOption("custom_secure_key", "")
         if custom_secure_key:
             encrypt_message = f"Encrypting $TARGET with key at {custom_secure_key}"
         else: