fix: set right permission on ssh key

precise/base-0k/hooks/install

@@ -109,6 +109,7 @@ EOF
 
 
 cp src/etc/ssh/lxc_git_access_id_rsa /etc/ssh/lxc_git_access_id_rsa
+chmod 0600 /etc/ssh/lxc_git_access_id_rsa
 
 cat <<EOF > ~/.ssh/config