Added error handling

UpdateWorker.cs

@@ -3,6 +3,9 @@
 namespace ServiceUpdater;
 
 public sealed class UpdateWorker(UpdaterConfig config) {
+
+    private int LastExitCode { get; set; }
+    
     public async IAsyncEnumerable<string> UpdateService(string serviceName) {
         yield return $"Starting update for {serviceName}";
 
@@ -10,13 +13,14 @@ public sealed class UpdateWorker(UpdaterConfig config) {
             yield return line;
         }
 
+        if (LastExitCode != 0)
+            yield break;
+
         yield return $"Downloaded changes for {serviceName}";
 
         await foreach (var line in RunProcess(serviceName, "compose up -d --remove-orphans")) {
             yield return line;
         }
-
-        yield return $"Successfully updated {serviceName}";
     }
 
     private async IAsyncEnumerable<string> RunProcess(string folder, string arguments) {
@@ -48,11 +52,12 @@ public sealed class UpdateWorker(UpdaterConfig config) {
             else {
                 var line = await error;
                 if (line == null) break;
-                yield return "[ERR] " + line;
+                yield return line;
                 error = process.StandardError.ReadLineAsync();
             }
         }
 
         await process.WaitForExitAsync();
+        LastExitCode = process.ExitCode;
     }
 }