Release pipeline always clones from `main`

See the git script used for releases to package up repos:

https://repo1.dso.mil/platform-one/big-bang/bigbang/-/blob/master/scripts/package/gits.sh#L8

The issue with this is that we are not cloning from the specific tag for each package in the release. If an MR is merged into main for Package X, but not going to be included in the release (ex: merged in after release branch is created/code freezed), the packaged repo in the release will include commits that are not actually part of the release.

Solution would just be to make sure we clone from the specific tag in the values.