util.prosodyctl.cert: Check success of copy operations, warn on fail
Debugging a case where certs are not imported correctly but prosodyctl
still reports success. Hoping this will shed some light on it.
For full information on our dependencies, version requirements, and
where to find them, see https://prosody.im/doc/depends
If you have luarocks available on your platform, install the following:
- luaexpat
- luasocket
- luafilesystem
- luasec