fish: add keychain for ssh key support

config/fish/config.fish

@@ -3,6 +3,7 @@
 ## Paths
 set -xU GOPATH $HOME/.go
 set -xU DOTFILES $HOME/.dotfiles
+set KEYFILE $HOME/.ssh/id_ed25519
 
 fish_add_path $HOME/.local/bin $HOME/.mix $HOME/.mix/escripts $HOME/.cargo/bin $GOPATH/bin
 
@@ -57,7 +58,7 @@ alias jctl="journalctl -p 3 -xb"
 alias cal="ncal -3Mb"
 
 if status is-interactive
-    # Commands to run in interactive sessions can go here
+    keychain --eval $KEYFILE | source
 end
 
 ## Load asdf if available