Better support GPG migrations

After yet another unpleasant experience starting up GPG on a new system, I
decided to encode my learnings and mistakes as aliases, functions, scripts,
hoping to protect my future me from myself. Fingers crossed!

configs/shared/zsh/aliases.zsh

@@ -49,6 +49,12 @@ alias mdg="mix deps.get"
 alias mdu="mix deps.update"
 alias mdup="mix docker.up"
 
+# GPG
+alias gpged='gpg --edit-key wpcarro@gmail.com'
+alias gpge='gpg --encrypt'
+alias gpgd='gpg --decrypt'
+alias gpgls='gpg --list-keys'
+
 # Git
 alias g="git"
 alias glp='git log --graph --pretty=format:"%Cred%h%Creset -%Cblue %an %Creset - %C(yellow)%d%Creset %s %Cgreen(%cr)%Creset" --abbrev-commit --date=relative'

configs/shared/zsh/variables.zsh

@@ -1,6 +1,7 @@
 export TERMINAL=urxvtc
 export EDITOR=emacsclient
 export ALTERNATE_EDITOR=nvim
+export GPG_TTY=$(tty) # "It is important that this environment variable always reflects the output of the tty command". Source: https://gnupg.org/documentation/manuals/gnupg-devel/Invoking-GPG_002dAGENT.html
 
 BROWSER=google-chrome
 NIXIFY="$HOME/programming/nixify"