workflows: build: add west blobs hal_nordic

Add west blob command to fetch hal_nordic.

Signed-off-by: Giacomo Dematteis <giacomo.dematteis@nordicsemi.no>

.github/workflows/build.yml

@@ -63,6 +63,7 @@ jobs:
           west config manifest.group-filter +bsec
           west config build.sysbuild True
           west update -o=--depth=1 -n
+          west blobs fetch hal_nordic
 
       - name: Install dependencies
         run: |