Move ssh-agent.sock to /var/run/user

Totally forgot about /var/run/user directory. There is already a place
for user specific tempfiles, so better use that one instead.

bash/bashrc

@@ -135,11 +135,7 @@ fi
 
 export PATH=${HOME}/.local/bin:${HOME}/.nix-profile/bin:${PATH}
 
-if [[ ! -d /tmp/ssh-1000 ]]; then
-	mkdir -m 0700 /tmp/ssh-1000
-fi
-
-export SSH_AUTH_SOCK=/tmp/ssh-1000/ssh-agent.sock
+export SSH_AUTH_SOCK=/var/run/user/$(echo $UID)/ssh-agent.sock
 
 if [[ ! $(pidof ssh-agent) ]]; then
 	eval $(ssh-agent -a ${SSH_AUTH_SOCK})