[release-5.7] Loki buildinfo is obscured

Description of problem:

Customer wanted to check the Loki version we use in our distribution to help with some external integration. However it seems to be obscured when checked internally:

$ curl -k https://localhost:3101/loki/api/v1/status/buildinfo
{"version":"","revision":"","branch":"","buildUser":"","buildDate":"","goVersion":""}

Although the information is public in the Dockerfile:

commit 8ce8168739bf629bd44f89f095b8705edf82a507 (origin/upstream-v2.9.4)

Version-Release number of selected component (if applicable):

Verified on OpenShift Logging 5.8.4

How reproducible:

Reproduced on 5.8.4

Steps to Reproduce:

$ oc rsh logging-loki-distributor-75c4864cc5-ln4m7
$ curl -k https://localhost:3101/loki/api/v1/status/buildinfo
{"version":"","revision":"","branch":"","buildUser":"","buildDate":"","goVersion":""}

While this is not a major/breaking issue, it can affect usability for integration with other processes and isn't "open"