feat: Minimal user api controller on hummingbird app, not sure there's big wins over vapor.

Sources/HApp/App.swift

@@ -3,7 +3,7 @@ import Hummingbird
 import Logging
 
 @main
-struct App: AsyncParsableCommand {
+struct App: AsyncParsableCommand, AppArguments {
 
   @Option(name: .shortAndLong)
   var hostname: String = "127.0.0.1"
@@ -14,16 +14,28 @@ struct App: AsyncParsableCommand {
   @Option(name: .shortAndLong)
   var logLevel: Logger.Level?
 
+  @Flag(name: .shortAndLong)
+  var migrate: Bool = false
+
+  @Flag(name: .shortAndLong)
+  var revert: Bool = false
+
+  @Flag(name: .shortAndLong)
+  var inMemoryDatabase: Bool = false
+
   func run() async throws {
-    let app = try await buildApplication(.init(hostname: hostname, port: port, logLevel: logLevel))
+    let app = try await buildApplication(self)
     try await app.runService()
   }
 }
 
 /// Extend `Logger.Level` so it can be used as an argument
-
 #if hasFeature(RetroactiveAttribute)
-  extension Logger.Level: @retroactive ExpressibleByArgument {}
+  extension Logger.Level: @retroactive ExpressibleByArgument {
+    public init?(argument: String) {
+      self.init(rawValue: argument)
+    }
+  }
 #else
   extension Logger.Level: ExpressibleByArgument {}
 #endif