Disable auto-merge in forks

[asbjornu]

This PR should disable Mergify's merge action in forks of GitVersion.

Description

As it's impossible to disable Dependabot in a fork (see dependabot/dependabot-core#2804), this PR disables Mergify's merge action when repository-full-name is different from GitTools/GitVersion. Forks will still receive Dependabot pull requests, but at least they won't be automatically merged (see asbjornu#94 as an example), forcing the fork to reset and force-push:

git checkout main
git fetch upstream
git reset --hard upstream/main
git push --force

How Has This Been Tested?

I haven't tested using repository-full-name anywhere before, so I'm just hoping this is going to work. I guess we'll have to wait and see until the next Dependabot PR is received.

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[mergify]

Thank you @asbjornu for your contribution!

[github-actions]

🎉 This issue has been resolved in version 5.8.3 🎉
The release is available on:

• GitHub Release
• Chocolatey Package
• .Net Global Tool

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