GitHub Actions deploy friendlyness

[DanySK]

Currently, Orchid defaults to the githubToken environment variable to acquire the GitHub token for deployment. This plays a bit badly with the default actions settings, though. I suggest that Orchid searches for a token in the following order:

1. existing githubToken environment variable (backwards compatible)
2. githubToken project property (which is automatically mirrored by the environment variable ORG_GRADLE_PROJECT_githubToken)
3. GITHUB_TOKEN environment variable