Fix RangeError bignum too big to convert into `long' on armhf platforms

On a 32-bit platform such as armhf, the original calculation for
the end date of the registry SSL certificate overflowed.
Use TimeDate to prevent this from occurring.

Closes #1390

files/gitlab-cookbooks/gitlab/libraries/registry.rb

@@ -88,7 +88,7 @@ module Registry
       cert = OpenSSL::X509::Certificate.new
       cert.subject = cert.issuer = OpenSSL::X509::Name.parse(subject)
       cert.not_before = Time.now
-      cert.not_after = Time.now + 18250 * 24 * 60 * 60
+      cert.not_after = (DateTime.now + 365 * 50).to_time
       cert.public_key = key.public_key
       cert.serial = 0x0
       cert.version = 2