Hi @ThorstenBux,
What do you mean by build scripts? Do you mean the build’s bitrise.yml config? If yes, you can get that manually from the Workflow Editor, in the bitrise.yml section. The bitrise.yml is also stored for every build, the one the build was running with, you can check that on the build’s page (Build’s Bitrise.yml button, above the logs).
To iterate over all the apps, that’s not possible yet, but will be soon, once the related endpoint is finished in the Bitrise Public API. Related discussion:
http://discuss.bitrise.io/t/bitrise-api-v0-1-work-in-progress/1554/1
If you have any questions just let us know! 