When filePath is absolute GITHUB_WORKSPACE shouldn't be joined #176
Description
When passing '/tmp/foobar.txt' as filePath (filePath: /tmp/foobar.txt) I got the error
Error: ENOENT: no such file or directory, open '/home/runner/work/user/project/tmp/foobar.txt'
actions-comment-pull-request/src/main.ts
Line 37 in d117ef6