On Debian 11, opening a terminal with bash will run a bashrc file
without the profile. The bashrc expects profile to be loaded, so it will
load the profile.
To avoid circular imports, .profile will set __PROFILE_LOADED__ and the
bashrc file will load the .profile if that variable has not been set.
After that check, bashrc will unset __PROFILE_LOADED__ as cleanup
• set environment variables in .profile load
• move bash settings to be in profile if they are for POSIX (sh/zsh/etc)
• use .d files in bash customizations
