Don't show run failure message when using a specific exit code

[binsee]

Link to Chatie/git-scripts#18 (comment)

The git push hook is designed to determine if push is allowed. If the hook returns non-zero, a red error message is bound to be displayed.

The push hook scripts we use need to run npm version, add a commit record, and execute a git push inside the hook, so it needs to prevent external git push, so it returns non-zero.

But when hook script returns non-zero, bin/hooks/pre-push will report an error, showing Failed to exec pre-push hook script.

If the hook actually ran successfully, we shouldn't show this prompt, so a specific exit code should be defined to identify this situation.

• use 42 as a specific exit code
• After the hook runs successfully, with 42 as the exit code
• When the exit code is 42 found in bin/hooks/*, do not display an error message and exit to git with a non-zero value.