Add Worker background service to log periodic messages

Added a Worker class in EnvelopeGenerator.ServiceHost that logs an informational message every second. Registered the Worker as a hosted service in Program.cs to run alongside the web API.

EnvelopeGenerator.ServiceHost/Program.cs

@@ -5,6 +5,7 @@ var builder = WebApplication.CreateBuilder(args);
 // Add services to the container.
 
 builder.Services.AddControllers();
+builder.Services.AddHostedService<Worker>();
 
 // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
 builder.Services.AddEndpointsApiExplorer();

EnvelopeGenerator.ServiceHost/Worker.cs

@@ -0,0 +1,23 @@
+namespace EnvelopeGenerator.ServiceHost;
+
+public class Worker : BackgroundService
+{
+    private readonly ILogger<Worker> _logger;
+
+    public Worker(ILogger<Worker> logger)
+    {
+        _logger = logger;
+    }
+
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        while (!stoppingToken.IsCancellationRequested)
+        {
+            if (_logger.IsEnabled(LogLevel.Information))
+            {
+                _logger.LogInformation("Worker running at: {time}", DateTimeOffset.Now);
+            }
+            await Task.Delay(1000, stoppingToken);
+        }
+    }
+}