Support overwriting bootstrap scripts

[moritzkiefer-da]

fixes #1170

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[moritzkiefer-da]

@nicu-da I did test this manually, do you have a great idea for an automatic test? We could set it in one of our deployments but that doesn't actually test anything unless the deployment breaks if the bootstrap script doesn't run and that goes against our whole idea of not really relying on bootstrap scripts. Also happy to merge it without a test if you agree.

[nicu-da]

I think it's simple enough that merging without testing should do the trick.
We could add a simple test that checks that the file is written correctly in a deployment in a pod/container directly

[moritzkiefer-da]

I think it's simple enough that merging without testing should do the trick.

going without a test for now then, thanks for the input