- Implement railpack.json + generated config deep merging logic in
ApplicationDeploymentJob with JSON validation and assoc array checks
- Label Railpack as "Beta" in all build pack selectors and show a
visible beta badge when railpack is selected in new-app forms
- Add railpack-nodejs Fastify example to ApplicationSeeder
- Add ApplicationSeederTest and ApplicationDeploymentRailpackConfigTest
covering config merge behavior and seeder correctness
Change default build_pack from railpack back to nixpacks in all new
application flows (GithubPrivateRepository, GithubPrivateRepositoryDeployKey,
PublicGitRepository) and reorder the build pack dropdown so Nixpacks
appears before Railpack across all relevant views.
Add feature tests covering the nixpacks default and selector ordering.
