Add workspaces to root package.json

Author: mbg

package-lock.json

@@ -15,6 +15,9 @@
     "transpile": "tsc --build --verbose"
   },
   "license": "MIT",
+  "workspaces": [
+    "pr-checks"
+  ],
   "dependencies": {
     "@actions/artifact": "^5.0.3",
     "@actions/artifact-legacy": "npm:@actions/artifact@^1.1.2",