Customize OpenAPI Generator template to minimize the amount of code overwritten during updates

[tschaffter]

Hint

I've used this approach in the past to fix a bug in the package rocc-client-angular automatically generated by the generator. Here are a few links that should put you on the right path:

• A config file is specified to OpenAPI Generator: https://github.com/Sage-Bionetworks/rocc-client-angular/blob/02ac3c9e7aca3afb9cc5a8199e5bf87fd6f10c8a/package.json#L12-L15
• The config file lists the template files to use: https://github.com/Sage-Bionetworks/rocc-client-angular/blob/main/projects/rocc-client/config.yaml
• Template files: https://github.com/Sage-Bionetworks/rocc-client-angular/tree/main/projects/rocc-client/templates