Add /etc/resolv.conf and /etc/ssl/certs to pages chroot

When pages chroots and tries to connect to an external url, it needs the /etc/resolve.conf to issue a dns lookup. If the URL uses SSL, it also needs access to /etc/ssl/certs.

Temporary fix is creating:

• /var/opt/gitlab/gitlab-rails/shared/pages/etc/resolv.conf as a copy of /etc/resolv.conf
• /var/opt/gitlab/gitlag-rails/shared/pages/etc/ssl/certs/cacerts.pem as a sum of all the pem files under /etc/ssl/certs/

but we need a permanent solution.