Improved performance of integration tests.

JSMR.Tests/Fixtures/MariaDbContainerFixture.cs

@@ -0,0 +1,42 @@
+using DotNet.Testcontainers.Builders;
+using JSMR.Tests.Fixtures;
+using JSMR.Tests.Ingestion;
+using Testcontainers.MariaDb;
+
+[assembly: AssemblyFixture(typeof(MariaDbContainerFixture))]
+
+namespace JSMR.Tests.Fixtures;
+
+public sealed class MariaDbContainerFixture : IAsyncLifetime
+{
+    const int MajorVersion = 10;
+    const int MinorVersion = 11;
+    const int Build = 6;
+
+    private MariaDbContainer _container = default!;
+
+    public string RootConnectionString { get; private set; } = default!;
+    public string TemplateDbName { get; } = "jsmr_template";
+
+    public async ValueTask InitializeAsync()
+    {
+        _container = new MariaDbBuilder()
+            .WithImage($"mariadb:{MajorVersion}.{MinorVersion}.{Build}")
+            .WithEnvironment("MARIADB_ROOT_PASSWORD", "rootpw")
+            .WithUsername("root")
+            .WithPassword("rootpw")
+            .WithWaitStrategy(Wait.ForUnixContainer().UntilInternalTcpPortIsAvailable(3306))
+            .Build();
+
+        await _container.StartAsync();
+
+        RootConnectionString = _container.GetConnectionString();
+
+        // Build the template ONCE with EF + your existing seed
+        await MariaDbClone.CreateTemplateAsync(
+            RootConnectionString,
+            TemplateDbName);
+    }
+
+    public async ValueTask DisposeAsync() => await _container.DisposeAsync();
+}