docs for environment variables in private components

Author: andrewjschuang

docs-v2/pages/environment-variables.mdx

@@ -114,6 +114,10 @@ You can reference the value of environment variables using `{{process.env.YOUR_E
   src="https://res.cloudinary.com/pipedreamin/image/upload/v1708551738/env-vars-feb-2024/env-vars-object-explorer-v2_x9afzl.png"
 />
 
+<Callout type="info">
+  Private components (actions or triggers) do not have direct access to the same environment execution variables as public components or custom code steps. To use environment variables in private components, add a prop specifically for the variable you need. For sensitive data like API keys, you can [configure the prop as a secret](https://pipedream.com/docs/components/api#props). In your prop configuration, set the value to `{{process.env.YOUR_ENV_VAR}}` to securely reference the environment variable.
+</Callout>
+
 ## Frequently Asked Questions
 
 ### What if I define the same variable key in my workspace env vars and project env vars?