feat(docker): Gracefully reload Caddy configuration

CaddyManager.Contracts/Docker/IDockerService.cs

@@ -10,4 +10,11 @@ public interface IDockerService
     /// </summary>
     /// <returns></returns>
     Task RestartCaddyContainerAsync();
+
+    /// <summary>
+    /// Method to gracefully reload the Caddy configuration without restarting the container. Caddy validates the
+    /// configuration before applying it, so a broken configuration leaves the running one untouched.
+    /// </summary>
+    /// <returns>Whether the reload succeeded, along with Caddy's output when it did not</returns>
+    Task<CaddyReloadResponse> ReloadCaddyContainerAsync();
 }