Azure functions attempts to use /bin/bash even if it doesn't exist

When using azure functions to start a function on nixos (linux), functions fails to start if /bin/bash does not exist. This can easily be mitigated by instead using /bin/sh or /usr/bin/env bash.

The payload names no file or test. Start by tracing the Azure Functions Core Tools Linux startup path that invokes /bin/bash on NixOS, then reproduce with /bin/bash absent; done means a function starts successfully without that path assumption and the behavior is covered by an appropriate regression check.

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