wip nightly cronjob CI

Author: Manishearth

.github/workflows/build-test.yml

@@ -18,6 +18,16 @@ on:
     branches: [ main ]
   pull_request:
     branches: '*'
+  workflow_dispatch:
+    inputs:
+      nightly:
+        description: "Test on latest nightly"
+        required: true
+        default: false
+        type: boolean
+  schedule:
+    # Run nightly cronjob CI every day at 14 UTC / 6AM PST / 3PM CET
+    - cron:  '0 14 * * *'
 
 jobs: