Scan fails when pull request is initiated from a Fork

[Mitch Spano]

When the scan is initiated on a fork of the repository, the scan will fail with the following error:

fatal: ambiguous argument 'origin/master...origin/fork-branch-name': unknown revision or path not in the working tree.

[Mitch Spano]

I think we need to to add the target repository as a different remote:

execSync(
  `git remote add -f destination ${this.pullRequest.base.repo.git_url}`
);
execSync(`git remote update`);
execSync(
    `git diff destination/${this.pullRequest?.base?.ref}...origin/${this.pullRequest?.head?.ref} > ${DIFF_OUTPUT}`
);

[Mitch Spano]

Unfortunately, adding a separate remote doesn't work as easily as one would hope:

Error: Command failed: git remote add -f destination git://github.com/mitchspano/testActions.git
fatal: unable to connect to github.com:
github.com[0: 140.82.114.4]: errno=Connection timed out