release-promotion caching issues

[bendk]

Our release promotion action seem to be re-running the swift-build-build and signing-* tasks. Let's look into this and ensure that it's using cached tasks instead of re-running them.

┆Issue is synchronized with this Jira Task
┆Epic: Automate build system for mobile consumption
┆Sprint End Date: 2023-07-27

[bendk]

I'm pretty sure @ahal fixed this one. I just ran a release-promotion action on the staging repo and I saw that:

• The swift-build task ran for the push, but not release-promotion
• The signing-* tasks ran for release-promotion, not for the push.