fix: str should be used not int when setting env variables

[statelesshz]

What does this PR do?

I'm sorry for incorrectly using int type to set environment variables in the previous PR. This PR addresses the problem.

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• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• Did you write any new necessary tests?

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cc @ydshieh

[amyeroberts]

Thanks for fixing!

I should have caught it in review too

[ydshieh]

Thanks for the fix. I am also always trapped by this .