Give build-nvidia a different name, bluebuild-nvidia, and restricted to only on changes to certain paths and when workflow buildbuild has been completed

.github/workflows/build-nvidia.yml

@@ -1,17 +1,17 @@
-name: bluebuild
+name: bluebuild-nvidia
 on:
-  schedule:
-    - cron:
-        "00 06 * * *" # build at 06:00 UTC every day
-        # (20 minutes after last ublue images start building)
   push:
     branches:
       - main
-    paths-ignore: # don't rebuild if only documentation has changed
-      - "**.md"
-
-  pull_request:
+    paths: # rebuild only if nvidia files have changed
+      - ".github/workflows/build-nvidia.yml"
+      - "files/scripts/nvidia/**"
+      - "recipes/components/nvidia-module.yml"
+      - "recipes/recipe_nvidia.yml"
   workflow_dispatch: # allow manually triggering builds
+  workflow_run:
+    workflows: ["bluebuild"]
+    types: [completed]
 concurrency:
   # only run one build at a time
   group: ${{ github.workflow }}-${{ github.ref || github.run_id }}