keychain
Re-use ssh-agent and/or gpg-agent between logins. More information: <http://funtoo.org/Keychain>.
RUN apt-get update && \
apt-get install -y keychain
RUN apt-get update && \
apt-get install -y keychain
RUN pacman -S --noconfirm keychain
RUN apt-get update && \
apt-get install -y keychain
RUN dnf install -y keychain
RUN apt-get update && \
apt-get install -y keychain