Update Launcher.php - call sh with absolute path

[nivadis]

use absolute path for sh command

[blizzz]

why would we want to do this?

[nivadis]

for me as example: the nixos nextcloud-cron doesn't have the valid $PATH to find sh.

but this will also be fixed hopefully NixOS/nixpkgs#356988
afaik the $PATH containing the location of sh is needed for POSIX compatibility

[blizzz]

I think it is fair to assume sh is present and the location based on the $PATH env var should always be preferred over a hard coded and assumed path.

What would be more acceptable is to check whether command -v sh results in a known path and stick with simple sh, and test for an existing /bin/sh only as fallback.

The most preferred solution though is that the nix package provides a path to the sh bin.

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[nivadis]

The fallback to /bin/sh sounds good to me, but i agree the issue should also be fixed on the nix side.