Enhance repeatability of the workflow

[davide-f]

Describe the feature you'd like to see

The repeatability of the results across runs and environments can be improved.
In #1172 (comment) it has been noted that the list of buses is not fully repeatable across nodes: despite the number of nodes is the same, their ordering in the dataframes is different that can lead to sligthly dissimilar results that lead to deviations in the results.

For the specific issue in the comment, potentially we could integrate a sorting approach before saving the results to sort buses and lines and improve repeatability of the results