Added LDAP health checks

src/HealthChecks/LDAPHealthChecks.cs

@@ -0,0 +1,31 @@
+using Berufsschule_HAM.Services;
+using Microsoft.Extensions.Diagnostics.HealthChecks;
+namespace Berufsschule_HAM.HealthChecks;
+
+public class DatabaseHealthCheck : IHealthCheck
+{
+    private readonly ILogger<DatabaseHealthCheck> _logger;
+    private readonly LdapService _ldapService;
+
+    public DatabaseHealthCheck(ILogger<DatabaseHealthCheck> logger, LdapService ldapService)
+    {
+        _logger = logger;
+        _ldapService = ldapService;
+    }
+
+    public async Task<HealthCheckResult> CheckHealthAsync(HealthCheckContext context, CancellationToken cancellationToken = default)
+    {
+        _logger.LogTrace("CheckHealthAsync - Checking health");
+        try
+        {
+            await _ldapService.ListUsersAsync();
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "CheckHealthAsync - Unable to list users due to exception {ex.Message} - {ex.StackTrace}", [ex.Message, ex.StackTrace]);
+            return HealthCheckResult.Unhealthy();
+        }
+        _logger.LogTrace("CheckHealthAsync - Health check successful");
+        return HealthCheckResult.Healthy();
+    }
+}