add build-host script for building specific workspaces

Author: danmarshall

package.json

@@ -5,6 +5,7 @@
   "scripts": {
     "clean": "npm run clean --workspaces --if-present",
     "build": "npm run build:00 --workspaces --if-present && npm run build:01 --workspaces --if-present && npm run build:02 --workspaces --if-present && npm run build:03 --workspaces --if-present && npm run build:04 --workspaces --if-present && npm run build:05 --workspaces --if-present && npm run build:06 --workspaces --if-present && npm run build:07 --workspaces --if-present && npm run build:08 --workspaces --if-present",
+    "build-host": "npm run build -w @microsoft/interactive-document-markdown && npm run build -w @microsoft/chartifact-sandbox && npm run build -w @microsoft/interactive-document-host",
     "start": "concurrently \"npm run dev -w common\" \"npm run dev -w @microsoft/interactive-document-markdown\" \"npm run dev -w schema\" \"npm run dev -w @microsoft/interactive-document-compiler\" \"npm run dev -w editor\"",
     "package": "npm run package --workspaces --if-present"
   },