add keychain zsh plugin

dot_zshrc.tmpl

@@ -1,10 +1,6 @@
-eval $(keychain --eval --agents ssh {{ .sshkey }})
-[ -f ~/.keychain/$HOSTNAME-sh ] && . ~/.keychain/$HOSTNAME-sh 2>/dev/null
-
 ZSH=$HOME/.oh-my-zsh
 
 ZSH_DISABLE_COMPFIX="true"
-# CASE_SENSITIVE="true"
 DISABLE_AUTO_TITLE="true"
 DISABLE_UNTRACKED_FILES_DIRTY="true"
 COMPLETION_WAITING_DOTS="false"
@@ -23,6 +19,8 @@ alias ccd='chezmoi cd'
 alias cdi='chezmoi diff'
 alias cap='chezmoi apply'
 
+zstyle :omz:plugins:keychain agents ssh
+zstyle :omz:plugins:keychain identities {{ .sshkey }}
 source $ZSH/oh-my-zsh.sh
 
 export LC_ALL=en_US.UTF-8