ci: Fix ['] escape regression in generate-env.sh
Revert commit 9904ea2c since it is not able to properly escape all special characters (i.e. [']).
Also note the POSIX conversion is not needed anymore, as we also make 'bash' available in LAVA rootfs.
Revert commit 9904ea2c since it is not able to properly escape all special characters (i.e. [']).
Also note the POSIX conversion is not needed anymore, as we also make 'bash' available in LAVA rootfs.