Go comes with hardcoded cacert. We add the usual in NixOS,
for easier NixOS life.

diff --git a/src/pkg/crypto/x509/root_unix.go b/src/pkg/crypto/x509/root_unix.go
index 76e79f4..6ef1dd3 100644
--- a/src/pkg/crypto/x509/root_unix.go
+++ b/src/pkg/crypto/x509/root_unix.go
@@ -15,6 +15,7 @@ var certFiles = []string{
 	"/etc/ssl/ca-bundle.pem",                 // OpenSUSE
 	"/etc/ssl/cert.pem",                      // OpenBSD
 	"/usr/local/share/certs/ca-root-nss.crt", // FreeBSD
+	"/etc/ssl/certs/ca-bundle.crt",           // NixOS
 }
 
 func (c *Certificate) systemVerify(opts *VerifyOptions) (chains [][]*Certificate, err error) {
