any docker pull fails otherwise:
Error while pulling image: Get https://index.docker.io/v1/repositories/ed/dind/images: x509: failed to load system roots and no roots provided
Requires(postun): /usr/sbin/groupdel
Requires(pre): /usr/bin/getgid
Requires(pre): /usr/sbin/groupadd
Requires(postun): /usr/sbin/groupdel
Requires(pre): /usr/bin/getgid
Requires(pre): /usr/sbin/groupadd
+Requires: ca-certificates
Requires: iproute2 >= 3.5
Requires: iptables
Requires: rc-scripts >= 0.4.0.10
Requires: iproute2 >= 3.5
Requires: iptables
Requires: rc-scripts >= 0.4.0.10