Resolve https://github.com/Microsoft/vscode-remote-try-dotnetcore/issues/3

.devcontainer/Dockerfile

@@ -3,7 +3,7 @@
 # Licensed under the MIT License. See LICENSE in the project root for license information.
 #-----------------------------------------------------------------------------------------
 
-FROM mcr.microsoft.com/dotnet/core/sdk:2.2
+FROM mcr.microsoft.com/dotnet/core/sdk:2.1
 
 # Install git, process tools
 RUN apt-get update && apt-get -y install git procps

.vscode/launch.json

@@ -8,9 +8,17 @@
             "name": ".NET Core Launch (web)",
             "type": "coreclr",
             "request": "launch",
-            "program": "dotnet",
-            "args": ["run"],
+            "preLaunchTask": "build",
+            "program": "${workspaceFolder}/bin/Debug/netcoreapp2.1/aspnetapp.dll",
+            "args": [],
             "cwd": "${workspaceFolder}",
+            "stopAtEntry": false,
+            "launchBrowser": {
+                "enabled": false
+            },
+            "env": {
+                "ASPNETCORE_ENVIRONMENT": "Development"
+            }
         }
     ]
 }