Issue #5: implement sqlite auth store and migrations

src/MxGateway.Server/GatewayApplication.cs

@@ -2,6 +2,7 @@ using MxGateway.Contracts;
 using MxGateway.Server.Configuration;
 using MxGateway.Server.Diagnostics;
 using MxGateway.Server.Metrics;
+using MxGateway.Server.Security.Authentication;
 
 namespace MxGateway.Server;
 
@@ -23,6 +24,7 @@ public static class GatewayApplication
         WebApplicationBuilder builder = WebApplication.CreateBuilder(args);
 
         builder.Services.AddGatewayConfiguration();
+        builder.Services.AddSqliteAuthStore();
         builder.Services.AddHealthChecks();
         builder.Services.AddSingleton<GatewayMetrics>();