feat(application): add Railpack as a new build type

- Introduce Railpack as a new build method for applications
- Update database schema to include 'railpack' in buildType enum
- Add Railpack installation and validation scripts for servers
- Implement Railpack build and command generation utilities
- Update UI to include Railpack as a build option with a 'New' badge

CONTRIBUTING.md

@@ -138,11 +138,18 @@ curl -sSL https://nixpacks.com/install.sh -o install.sh \
     && ./install.sh
 ```
 
+```bash
+# Install Railpack
+curl -sSL https://railpack.com/install.sh | sh
+```
+
 ```bash
 # Install Buildpacks
 curl -sSL "https://github.com/buildpacks/pack/releases/download/v0.32.1/pack-v0.32.1-linux.tgz" | tar -C /usr/local/bin/ --no-same-owner -xzv pack
 ```
 
+
+
 ## Pull Request
 
 - The `main` branch is the source of truth and should always reflect the latest stable release.