devcontainer fixes (#688)

* adding runargs section to fix docker access from devcontainer to host

* updating integrated terminal settings to match with the most recent settings.json scheme

* updating base image to most recent dotnet sdk version

Co-authored-by: Steve Smith <steve@kentsmiths.com>

.devcontainer/devcontainer.json

@@ -15,10 +15,18 @@
 	// Comment out to connect as root user. See https://aka.ms/vscode-remote/containers/non-root.
 	// make sure this is the same as USERNAME above
 	"remoteUser": "vscode",
-
+  "runArgs": [
+    "-v",
+    "/var/run/docker.sock:/var/run/docker.sock"
+  ],
 	// Set *default* container specific settings.json values on container create.
 	"settings": {
-		"terminal.integrated.shell.linux": "/bin/bash"
+    "terminal.integrated.profiles.linux": {
+      "bash": {
+        "path": "bash",
+        "icon": "terminal-bash"
+      },
+    },
 	},
 
 	// Add the IDs of extensions you want installed when the container is created.