Remove cron based builds.
diff --git a/.github/workflows/build_docker_image.yaml b/.github/workflows/build_docker_image.yaml
index 5a53a57..829c291 100644
--- a/.github/workflows/build_docker_image.yaml
+++ b/.github/workflows/build_docker_image.yaml
@@ -10,8 +10,6 @@
   pull_request:
     branches:
       - master
-  schedule:
-    - cron: '0 1 * * *'
 
 env:
   REGISTRY: ghcr.io