community/lxcfs: modprobe requires -a for multiple modules
'modprobe fuse autofs4' will pass autofs4 as an argument to fuse module loading, which is not what was intended here. Using modprobe with -a properly loads both modules, or skips if they were built-in, and fails if one of those was neither built-in nor a module.
Not actually using lxc so not tested, found by manually looking at the PR looking at autofs or fuse: both actually should be loaded automatically by the kernel when a pre-created device is opened, but alpine does not seem to have a way of pre-creating such devices, so keeping the modprobe here.