Update dev container for .NET 5

.devcontainer/Dockerfile

@@ -20,4 +20,6 @@ RUN if [ "$INSTALL_AZURE_CLI" = "true" ]; then bash /tmp/library-scripts/azcli-d
 #     && apt-get -y install --no-install-recommends <your-package-list-here>
 
 # [Optional] Uncomment this line to install global node packages.
-# RUN su vscode -c "source /usr/local/share/nvm/nvm.sh && npm install -g <your-package-here>" 2>&1
+# RUN su vscode -c "source /usr/local/share/nvm/nvm.sh && npm install -g <your-package-here>" 2>&1
+
+RUN mkdir -p /usr/local/share/dotnet/sdk/NuGetFallbackFolder

.devcontainer/devcontainer.json

@@ -6,7 +6,7 @@
 		"dockerfile": "Dockerfile",
 		"args": {
 			// Update 'VARIANT' to pick a .NET Core version: 2.1, 3.1, 5.0
-			"VARIANT": "2.1",
+			"VARIANT": "5.0",
 			// Options
 			"INSTALL_NODE": "false",
 			"NODE_VERSION": "lts/*",

.vscode/launch.json

@@ -10,7 +10,7 @@
             "request": "launch",
             "preLaunchTask": "build",
             // If you have changed target frameworks, make sure to update the program path.
-            "program": "${workspaceFolder}/bin/Debug/netcoreapp2.1/FuGetGallery.dll",
+            "program": "${workspaceFolder}/bin/Debug/net5.0/FuGetGallery.dll",
             "args": [],
             "cwd": "${workspaceFolder}",
             "stopAtEntry": false,