Fix python call in UF2 generation. #4392
Merged
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The call to generate UF2 files in the platformio custom script was a bare call to python. In some environments, this command won't exist in this way. Instead, use the standard env approach to find the right python.
Without this change, a user may see:
"""
Generating UF2 file
sh: 1: python: not found
"""
Additionally, add the shebang line on line 1 so this script can be executed standalone if needed.