feat: Initialize Zastava Webhook service with TLS and Authority authentication

- Added Program.cs to set up the web application with Serilog for logging, health check endpoints, and a placeholder admission endpoint.
- Configured Kestrel server to use TLS 1.3 and handle client certificates appropriately.
- Created StellaOps.Zastava.Webhook.csproj with necessary dependencies including Serilog and Polly.
- Documented tasks in TASKS.md for the Zastava Webhook project, outlining current work and exit criteria for each task.

src/StellaOps.Concelier.Exporter.TrivyDb.Tests/TrivyDbFeedExporterTests.cs

@@ -11,6 +11,7 @@ using System.Threading.Tasks;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging.Abstractions;
 using Microsoft.Extensions.Options;
+using MongoDB.Driver;
 using StellaOps.Concelier.Exporter.Json;
 using StellaOps.Concelier.Exporter.TrivyDb;
 using StellaOps.Concelier.Models;
@@ -733,17 +734,27 @@ public sealed class TrivyDbFeedExporterTests : IDisposable
             _advisories = advisories;
         }
 
-        public Task<IReadOnlyList<Advisory>> GetRecentAsync(int limit, CancellationToken cancellationToken)
-            => Task.FromResult(_advisories);
-
-        public Task<Advisory?> FindAsync(string advisoryKey, CancellationToken cancellationToken)
-            => Task.FromResult<Advisory?>(_advisories.FirstOrDefault(a => a.AdvisoryKey == advisoryKey));
-
-        public Task UpsertAsync(Advisory advisory, CancellationToken cancellationToken)
-            => Task.CompletedTask;
-
-        public IAsyncEnumerable<Advisory> StreamAsync(CancellationToken cancellationToken)
+        public Task<IReadOnlyList<Advisory>> GetRecentAsync(int limit, CancellationToken cancellationToken, IClientSessionHandle? session = null)
         {
+            _ = session;
+            return Task.FromResult(_advisories);
+        }
+
+        public Task<Advisory?> FindAsync(string advisoryKey, CancellationToken cancellationToken, IClientSessionHandle? session = null)
+        {
+            _ = session;
+            return Task.FromResult<Advisory?>(_advisories.FirstOrDefault(a => a.AdvisoryKey == advisoryKey));
+        }
+
+        public Task UpsertAsync(Advisory advisory, CancellationToken cancellationToken, IClientSessionHandle? session = null)
+        {
+            _ = session;
+            return Task.CompletedTask;
+        }
+
+        public IAsyncEnumerable<Advisory> StreamAsync(CancellationToken cancellationToken, IClientSessionHandle? session = null)
+        {
+            _ = session;
             return EnumerateAsync(cancellationToken);
 
             async IAsyncEnumerable<Advisory> EnumerateAsync([EnumeratorCancellation] CancellationToken ct)