Github Action to prevent large files

[Wumpf]

Part of #1403

Checklist

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[Wumpf]

does not check for accidental LFS files, just rooting for other stuff in CI breaking then ;)

[jleibs]

Not that it really matters for this use-case, but stat should be a lot faster since it uses the filesystem rather than wc which I think is actually consuming the file stream characters from the input pipe.

Suggested change

	actualsize=$(wc -c <"$file")
	actualsize=$(stat -c%s "$file")

[Wumpf]

I know nothing about these. Will do :)

[Wumpf]

stat doesn't have that size filtering option on my mac it seems. I'll leave it be

[emilk]

yet another reason to do this in Python

[jleibs]

Any particular reason for doing this as bash instead of python?

[Wumpf]

Any particular reason for doing this as bash instead of python?

Should have done python given that I spent soo much time figuring it out. Story is that I first had it in its own job and didn't want to install python. Then moved it into the util job which already has it but didn't convert it