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The goroutine tasked with killing the child process when the context
is canceled must not panic on error. Instead it must provide a channel to allow
the goroutine that launched it to collect the error. And this
goroutine can then panic with the error, knowing it will be caught
upper in the stack and handled gracefully instead of aborting the
entire process.

Otherwise gitea will fail with "unexpected EOF"

because fetching the repository is also delegated to the uploader
and the downloader needs to work within the fetched repository to
build the references and collect the commits that make a pull request

easier for comparison purproses

See https://github.com/go-gitea/gitea/pull/19855/files