ci: metadata checks for docs

check if metadata needs to be rebuilt!

Signed-off-by: Ramon Roche <mrpollo@gmail.com>

.github/workflows/docs_metadata_check.yml

@@ -0,0 +1,26 @@
+name: Docs Metadata Checks
+
+# Grant write permission so PR workflows can commit updated JSONs back
+permissions:
+  contents: write
+
+on:
+  pull_request: {}
+  push:
+    branches:
+      - main
+      - 'release/**'
+
+jobs:
+  uorb-graph-check:
+    name: Check uORB graph JSONs
+    runs-on: [runs-on,runner=4cpu-linux-x64,image=ubuntu22-full-x64,"run-id=${{ github.run_id }}",spot=true]
+    container:
+      image: ghcr.io/px4/px4-dev:v1.16.0-rc1
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Run uORB graph docs check
+        run: Tools/ci/metadata_uorb_graph.sh --test-only