specify python version

Co-authored-by: Daniel Kaufman <114174502+danielfromearth@users.noreply.github.com>

Author: ank1m

.github/workflows/build-pipeline.yml

@@ -10,6 +10,7 @@ on:
       - '[0-9]+.[0-9]+.[0-9]+rc[0-9]+'
 
 env:
+  PYTHON_VERSION: "3.12"
   REGISTRY: ghcr.io
   IMAGE_NAME: ${{ github.repository }}