Fetch tags in CI

[junoatwork]

Attempts to fix the CI failure in #29 . The workspace_status script for Bazel was failing because git tags weren't being checkout out, so it couldn't generate the release tag version.

[junoatwork]

Looks like it's still not working! I tried reproducing on local docker, but it builds fine and gets workspace_status as I'd expect:

root@6970fdbf6be2:/source# cat bazel-out/volatile-status.txt 
BUILD_TIMESTAMP 1714505297
FORMATTED_DATE 2024 Apr 30 19 28 17 Tue
RELEASE_VERSION v8.4.0-6-g22ce501

Putting this aside for now, but hopefully this is a helping hint.