make docker dev install posix compliant (PR #7995)

we cant expect /bin/bash to be around on every system. Depending on /bin/sh instead makes the docker install for development work on nixos aswell.


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I’m not sure all these scripts are compatible with regular sh - @SamSaffron wrote most of them and could chip in.

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Oops… looks like we need to close this, sorry, the changes are not bin/sh compliant :frowning: