Pre-release workflows: truncate diff when needed

[tidoust]

This update truncates the diff when it cannot fit in a PR description. The full diff gets dumped to the console instead.

Fixes #244.

[dontcallmedom]

LGTM - is there any motivation to the 60,000 max?

[tidoust]

LGTM - is there any motivation to the 60,000 max?

It's rather a lack of motivation to count the rest of the description precisely. This leaves a bit of room for extending the description if needed, and avoids having to think about off-by-1 errors ;)

[dontcallmedom]

It's rather a lack of motivation to count the rest of the description precisely. This leaves a bit of room for extending the description if needed, and avoids having to think about off-by-1 errors ;)

I guess my question was imprecise, but I'm guessing there is an actual upper bound of 65,536 characters then (I couldn't find the documentation of that limit)

[tidoust]

I don't know where that limit is documented either. It appears in the error message returned by the GitHub API in the logs:

Validation Failed:
{
  "resource": "Issue",
  "code": "custom",
  "field": "body",
  "message": "body is too long (maximum is 65536 characters)"
}