[BUG] Run/debug single node doesn't work with the chat-with-pdf example

[tcycherry]

Describe the bug
Run/debug single node doesn't work with the chat-with-pdf example, since it depends on environment variables that was setup in the setup_env step.

How To Reproduce the bug
It's consistent repro:

1. Open the chat-with-pdf example mentioned in the e2e tutorial with the vscode extension
2. Follow the tutorial to run the flow successfully
3. Then try to run a single node, which will fail by complaining a missing environment variable etc.

Expected behavior
Single node run/debug can work. I believe this requires some redesign of the sample but would be nice to leverage the single node debug capability.

Screenshots

Running Information(please complete the following information):

• Promptflow Package Version using pf -v: 0.1.0b5
• Operating System: macOS 13.5
• Python Version using python --version: Python 3.9.17
• VS code extension: 1.0.7

Additional context

[henry-zeng]

thanks for the suggestion, the time when you run the whole flow or do bulk test, the setup_env step will set the environment variable for you in the current python process, while when you just run the single node, the env variable is not set, so the step will fail, you can either set the open ai key to your system environment variable, and run the single step again.

we have other samples to use the OpenAI connection directly in the step which required OAI key, then you can run that node direclty.

[github-actions]

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