Clear existing env variables for containers before adding from docker…

… CLI (#393)

The env var we pass to container would be returned from docker inspect command

Resolves #392

src/Aspire.Hosting/Dashboard/DashboardViewModelService.cs

@@ -212,6 +212,7 @@ private static async Task FillEnvironmentVariablesFromDocker(ContainerViewModel
                                 envVars.Add(new EnvVar { Name = parts[0], Value = parts[1] });
                             }
                         }
+                        containerViewModel.Environment.Clear();
                         FillEnvironmentVariables(containerViewModel.Environment, envVars, envVars);
                     }
                 }