Add scheduled CI job

Author: vrza

.github/workflows/build.yml

@@ -1,6 +1,10 @@
 name: build
 
-on: [push, pull_request]
+on:
+  push:
+  pull_request:
+  schedule:
+    - "0 5 * * 1"  # At 05:00 UTC every Monday
 
 jobs:
 
@@ -46,7 +50,9 @@ jobs:
         npm install nan@"$earliest_nan_version"
 
     - name: Install dependencies and build
-      run: npm install
+      run: |
+	    npm install
+		npm explain nan
 
     - name: Run linter
       run: node node_modules/eslint/bin/eslint .