crypto/x509: add /usr/local/share/ca-certificates to certificate directories

[mmiranda96]

This is the default ca-certificate path in Debian/Ubuntu. Similar to this issue.

[adamdecaf]

What version of ubuntu is this for?

The update-ca-certificates tool mentions these belong in /usr/share/ca-certificates. (Ubuntu 17.10)

root@b3ac6efab8f7:/# cat /etc/ca-certificates.conf 
# This file lists certificates that you wish to use or to ignore to be
# installed in /etc/ssl/certs.
# update-ca-certificates(8) will update /etc/ssl/certs by reading this file.
#
# This is autogenerated by dpkg-reconfigure ca-certificates.
# Certificates should be installed under /usr/share/ca-certificates
# and files with extension '.crt' is recognized as available certs.
#
# line begins with # is comment.
# line begins with ! is certificate filename to be deselected.
#

Go reads a bundle file from /etc/ssl/certs/ca-certificates.crt in this case which update-ca-certificates generates.

[mmiranda96]

I'm using Debian 9.3, but it seems I was wrongly installing a certificate. Sorry for the inconvenience.