chore: run pre & post install scripts

[jobala]

Summary

Fixes #523

Removes the cache check and always runs npm install

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[lukasholzer]

Looks good from looking at it. Can you maybe write a bats test for it? especially the thing with the feature flag?

[JGAntunes]

Looking good 👍 left a small set of comments

[JGAntunes]

🎉