Specify the TZ to get rid of warnings like this below because we're mounting /etc/localtime directly.
> Sys.timezone()
Failed to create bus connection: No such file or directory
Warning: Your system is mis-configured: ‘/etc/localtime’ is not a symlink
Warning: It is strongly recommended to set envionment variable TZ to ‘America/New_York’ (or equivalent)
Specify the TZ to get rid of warnings like this below because we're mounting
/etc/localtimedirectly.