New scheduled workflow which will trigger the unstable build and package workflow (#457)

Author: valeria-raif

.github/workflows/nightly-unstable-package.yml

@@ -0,0 +1,12 @@
+name: Nightly Unstable Build and Package
+
+on:
+  schedule:
+    - cron: '0 1 * * *'  # Run every day at 1:00 AM UTC
+  workflow_dispatch:  # Allow manual triggering
+
+jobs:
+  build-and-test-unstable:
+    uses: ./.github/workflows/pre-merge.yml@unstable
+    with:
+      ref: 'unstable'