feat: Better handling of unhandled errors

ace-tests/Reworked/ErrorTests.cs

@@ -0,0 +1,35 @@
+using ACE;
+
+namespace ACE_Tests.Reworked;
+
+[Parallelizable(ParallelScope.Self)]
+public class ErrorTests
+{
+    [Test]
+    public async Task Error_WhenThereIsExceptionThrownBecauseOfInvalidTemplatePath_ACEShouldNotCrash()
+    {
+        var exitCode = await Program.Main([
+                "templates/reworked/key-vault/usage-pattern-1.bicep",
+                "cf70b558-b930-45e4-9048-ebcefb926adf",
+                "arm-estimator-tests-rg",
+                "--inline",
+                "parLocation=northeurope"
+            ]);
+
+        Assert.That(exitCode, Is.EqualTo(1));
+    }
+
+    [Test]
+    public async Task Error_WhenThereIsExceptionThrownBecauseOfWrongParameter_ACEShouldNotCrash()
+    {
+        var exitCode = await Program.Main([
+                "templates/reworked/key-vault/usage-patterns-1.bicep",
+                "cf70b558-b930-45e4-9048-ebcefb926adf",
+                "arm-estimator-tests-rg",
+                "--inline",
+                "parLocation2=northeurope"
+            ]);
+
+        Assert.That(exitCode, Is.EqualTo(1));
+    }
+}

ace/Program.cs

@@ -3,6 +3,8 @@
 using ACE.WhatIf;
 using Microsoft.Extensions.Logging;
 using System.CommandLine;
+using System.CommandLine.Builder;
+using System.CommandLine.Parsing;
 using System.Reflection;
 using System.Text;
 using System.Text.Json;
@@ -267,7 +269,19 @@ public static async Task<int> Main(string[] args)
         rootCommand.AddCommand(managementGroupCommand);
         rootCommand.AddCommand(tenantCommand);
 
-        return await rootCommand.InvokeAsync(args);
+        try
+        {
+            var parser = new CommandLineBuilder(rootCommand)
+                .UseDefaults()
+                .Build();
+
+            return parser.Invoke(args);
+        }
+        catch(Exception ex)
+        {
+            Console.Error.WriteLine("An error occurred: {0}", ex.Message);
+            return 1;
+        }
     }
 
     private static async Task<int> Estimate(FileInfo templateFile,