start CI jobs every 12h and run with python 3.12

Author: bgruening

.github/workflows/main.yml

@@ -5,14 +5,14 @@ on:
     branches:
       - master
   schedule:
-    - cron: "0 */6 * * *"
+    - cron: "0 */12 * * *"
 jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
       matrix:
         python-version:
-          - '3.10'
+          - '3.12'
         singularity-version:
           - '3.8.3'
     steps: