Skip Git hook repository check to enable build without .git

[joschi]

The build process would fail if the .git/ directory is missing, e. g. when downloading the repository contents from GitHub in a ZIP archive:

[ERROR] Failed to execute goal io.github.phillipuniverse:githook-maven-plugin:1.0.5:install (default) on project openapi-diff-parent: Not a git repository, could not find a .git/hooks directory anywhere in the hierarchy of /path/to/openapi-diff/target. Turn off this behavior with skipRepositoryCheck=false -> [Help 1]

After the change, a missing .git/ directory doesn't lead to a build failure:

[INFO] --- githook-maven-plugin:1.0.5:install (default) @ openapi-diff-parent ---
[INFO] No .git directory found, skipping plugin execution

Refs #299

[sonarqubecloud]

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