Resolve issue running the GitLab provided install script on a CIS hardened Ubuntu Pro install

[ianburrowes]

After applying the CIS hardening scripts to Ubuntu Pro the default umask changes to user read only (instead of read all). As a result, the GitLab provided install script adds the GitLab PGP key for the apt repository with insufficient permissions. This change ensures the umask has all+read (the default Ubuntu permissions), before the GitLab install script runs. Fixes #202

[philchristensen]

FYI, this worked perfectly for my similar issue on a CIS-hardened Ubuntu AMI from the CIS Foundation.

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