diff --git a/.github/workflows/build-nightly.yml b/.github/workflows/build-nightly.yml
index debfc5235..31fef5d28 100644
--- a/.github/workflows/build-nightly.yml
+++ b/.github/workflows/build-nightly.yml
@@ -1,5 +1,6 @@
 name: Build nightly container image
 on:
+  workflow_dispatch:
   schedule:
     - cron: '0 2 * * *' # run at 2 AM UTC
 permissions: