delete set_env.py after running in tox.yml

[zacharyburnett]

resolves #115

This attempts to solve the issue in #115 by not writing set_env.py to a file deleting set_env.py after running.

[zacharyburnett]

@ConorMacBride I apologize, I can't add reviewers to this PR. Do you think this is the correct approach to solving #115?

[zacharyburnett]

Attempting to execute the script as a string with python -c $($SET_ENV_SCRIPT | base64 --decode) did not work:
https://github.com/OpenAstronomy/github-actions-workflows/actions/runs/4429010028/jobs/7768901699#step:7:19

/home/runner/work/_temp/36262a4b-6471-4412-9bef-f6752a990797.sh: 2: 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: File name too long
Argument expected for the -c option
usage: python [option] ... [-c cmd | -m mod | file | -] [arg] ...
Try `python -h' for more information.

[ConorMacBride]

Thanks @zacharyburnett! It's a good idea to clean up this script after it's used.

[zacharyburnett]

thanks! This seems to have solved the issue in the JWST tests - https://github.com/spacetelescope/jwst/actions/runs/4418621315/jobs/7769529427