feat: Choose database provider from a configuration file

src/Host/CTF.Host.csproj

@@ -5,6 +5,7 @@
     </PropertyGroup>
 
   <ItemGroup>
+    <ProjectReference Include="..\Persistence\Persistence.InMemory\Persistence.InMemory.csproj" />
     <ProjectReference Include="..\Persistence\Persistence.MariaDB\Persistence.MariaDB.csproj" />
     <ProjectReference Include="..\Persistence\Persistence.SQLite\Persistence.SQLite.csproj" />
   </ItemGroup>

src/Host/Extensions/DatabaseProviderExtensions.cs

@@ -0,0 +1,25 @@
+namespace CTF.Host.Extensions;
+
+public static class DatabaseProviderExtensions
+{
+    public static void ChooseDatabaseProvider(
+        this IServiceCollection services,
+        IConfiguration configuration)
+    {
+        var providers = new Dictionary<string, Action>(StringComparer.OrdinalIgnoreCase)
+        {
+            { "InMemory", () => services.AddPersistenceInMemoryServices(configuration) },
+            { "SQLite",   () => services.AddPersistenceSQLiteServices(configuration) },
+            { "MariaDb",  () => services.AddPersistenceMariaDBServices(configuration) },
+        };
+
+        string selectedProvider = configuration["DatabaseProvider"];
+        if (providers.TryGetValue(selectedProvider, out Action databaseProvider))
+        {
+            databaseProvider();
+            return;
+        }
+
+        throw new NotSupportedException($"Provider '{selectedProvider}' is not supported");
+    }
+}

src/Host/Startup.cs

@@ -9,7 +9,7 @@ public void Configure(IServiceCollection services)
             .AddEnvironmentVariables()
             .Build();
 
-        services.AddPersistenceSQLiteServices(configuration);
+        services.ChooseDatabaseProvider(configuration);
         services.AddApplicationServices();
 
         // Add systems to the services collection
@@ -25,4 +25,4 @@ public void Configure(IEcsBuilder builder)
             .EnablePlayerCommands()
             .EnableRconCommands();
     }
-}
+}

src/Host/Usings.cs

@@ -5,5 +5,7 @@
 global using Microsoft.Extensions.DependencyInjection;
 global using Microsoft.Extensions.Configuration;
 global using CTF.Application;
+global using CTF.Host.Extensions;
 global using Persistence.SQLite;
-global using Persistence.MariaDB;
+global using Persistence.MariaDB;
+global using Persistence.InMemory;