pre-building package geoadmin before previewing the mapviewer

as we are running a preview on a "from scratch" CI instance, geoadmin package has never been built (and added to the local npm registry for that matter).
Building the lib with the same target in mind before running the preview script on the viewer

package.json

@@ -10,10 +10,10 @@
     "build:dev": "npm run build:dev --workspaces",
     "build:int": "npm run build:int --workspaces",
     "build:prod": "npm run build:prod --workspaces",
-    "preview": "npm run preview --workspace=web-mapviewer",
-    "preview:dev": "npm run preview:dev --workspace=web-mapviewer",
-    "preview:int": "npm run preview:int --workspace=web-mapviewer",
-    "preview:prod": "npm run preview:prod --workspace=web-mapviewer",
+    "preview": "npm run build --workspace=geoadmin && npm run preview --workspace=web-mapviewer",
+    "preview:dev": "npm run build:dev --workspace=geoadmin && npm run preview:dev --workspace=web-mapviewer",
+    "preview:int": "npm run build:int --workspace=geoadmin && npm run preview:int --workspace=web-mapviewer",
+    "preview:prod": "npm run build:prod --workspace=geoadmin && npm run preview:prod --workspace=web-mapviewer",
     "test:unit": "npm run test:unit --workspaces --if-present",
     "test:unit:watch": "npm run test:unit:watch --workspaces --if-present",
     "test:e2e": "npm run test:e2e --workspace=web-mapviewer",