fix(ci): change workflow to be triggered nightly

Author: baptistecolle

.github/workflows/integration-test.yaml

@@ -2,23 +2,8 @@ name: Run integration tests
 
 on:
   workflow_dispatch:
-  push:
-    branches:
-      - 'main'
-  pull_request:
-    paths:
-      - ".github/workflows/build.yaml"
-      - ".github/workflows/matrix.json"
-      - "integration-tests/**"
-      - "backends/**"
-      - "core/**"
-      - "router/**"
-      - "Cargo.lock"
-      - "rust-toolchain.toml"
-      - "Dockerfile"
-      - "Dockerfile-intel"
-    branches:
-      - 'main'
+  schedule:
+    - cron: '0 0 * * *'  # Run the workflow nightly to check Gaudi integration is working
 
 jobs:
   tests: