SLES 12.5 - gitlab 18.9.1 cannot be installed

Originally reported in g_build as a pipeline failure blocking release.

Pipeline failed here: https://dev.gitlab.org/gitlab/omnibus-gitlab/-/jobs/34434769

Copy paste from the output there:

Retrieving package gitlab-ee-18.9.1-ee.0.sles12.x86_64 (1/1),  1.41 GiB ( 3.91 GiB unpacked)
Retrieving: gitlab-ee-18.9.1-ee.0.sles12.x86_64.rpm [.......done (183.3 MiB/s)]
Checking for file conflicts: [............done]
Installation of gitlab-ee-18.9.1-ee.0.sles12.x86_64 failed:
Error: Subprocess failed. Error: RPM failed: warning: /var/cache/zypp/packages/gitlab_gitlab-ee/Packages/g/gitlab-ee-18.9.1-ee.0.sles12.x86_64.rpm: Header V4 RSA/SHA1 Signature, key ID 82dd593d: NOKEY
error: gitlab-ee-18.9.1-ee.0.sles12.x86_64: install failed
(1/1) Installing: gitlab-ee-18.9.1-ee.0.sles12.x86_64 [.......................................................................error]

The signature log was determined to not be significant here.

It looks like the package install is attempted and at the very end it fails:

/var/cache/zypp/packages/gitlab_gitlab-ee/Packages/g/gitlab-ee-18.9.1-ee.0.sles12.x86_64.rpm


...
...
...
D: create     100644  2 (   0,   0)   336 /opt/gitlab/embedded/share/terminfo/z/zen50;699f1a8e
XZDIO:  583775 reads, 4224328716 total bytes in 112.769318 secs
error: gitlab-ee-18.9.1-ee.0.sles12.x86_64: install failed