[guix] Deterministic builds

Some fixes to create deterministic (i.e. bit-for-bit reproducible) builds with guix.

1. Feature description was added to the changelog
2. Check full config (tested only one enabled process)
3. Check guix-created containers

changed milestone to %6.5.0

added workflowin development label

marked the checklist item Check guix-created containers as completed

marked the checklist item Check full config (tested only one enabled process) as completed

marked this merge request as ready

added workflowplease review label and removed workflowin development label

approved this merge request

resolved all threads

mentioned in commit b773bf49

merged

removed workflowplease review label

marked the checklist item Feature description was added to the changelog as completed