Remove cron build of buster as it no longer releases

Author: josmartin

.github/workflows/release-debian-buster.yaml

@@ -6,8 +6,6 @@ name: "release-debian-buster"
 # ensure all artifacts are up-to-date with security and other patches to these distributions
 on:
   workflow_dispatch:
-  schedule:
-    - cron:  '0 7 1 * *'  
 
 # Wish I could use a matrix strategy here - tried to and discovered that there are limitations
 #     The strategy property is not supported in any job that calls a reusable workflow.
@@ -17,4 +15,4 @@ jobs:
     uses: ./.github/workflows/build-glibc-and-release.yaml
     with: 
       dist-base: debian
-      dist-tag: buster
+      dist-tag: buster