with-ssh-agent

#!/usr/bin/env sh
set -eu
eval $(ssh-agent -s)

KEYS=$(ls -p /var/ssh-keys/ | grep -v -e '/' -e config -e known_hosts -e '.pub$' -e authorized_keys)
echo "$KEYS" | xargs -I % ssh-add /var/ssh-keys/%

mkdir -p /root/.ssh
ssh-keyscan github.com >> /root/.ssh/known_hosts
echo 'host github.com' > /root/.ssh/config
echo ' HostName github.com' >> /root/.ssh/config
echo ' User git' >> /root/.ssh/config
echo "$KEYS" | sed 's/^/ IdentityFile \/var\/ssh-keys\//' >> /root/.ssh/config
$@