feat: Adds middleware to routes

Sources/App/Middleware/DependenciesMiddleware.swift

@@ -0,0 +1,27 @@
+import DatabaseClientLive
+import Dependencies
+import Vapor
+
+// Taken from discussions page on `swift-dependencies`.
+
+// TODO: Pass dependencies to set into this middleware.
+struct DependenciesMiddleware: AsyncMiddleware {
+
+  private let values: DependencyValues.Continuation
+
+  init() {
+    self.values = withEscapedDependencies { $0 }
+  }
+
+  func respond(to request: Request, chainingTo next: any AsyncResponder) async throws -> Response {
+    try await values.yield {
+      try await withDependencies {
+        $0.database = .live(database: request.db)
+        $0.dateFormatter = .liveValue
+      } operation: {
+        try await next.respond(to: request)
+      }
+    }
+  }
+
+}