Build Queues

This ties in with https://github.com/defang-io/defang/issues/169 to some extent. With most systems I've come across with build queues, you can see historical data about how builds went, but you also get information about queued builds:

• if they're in the same project/org you might see other queued builds
• if they're not, you might see a number of builds ahead of yours
• systems like GitLab sometimes give you information about build runners

Essentially, given that the build queue and build runner status determine how fast my build becomes available, I want to be able to have a sense of what's going on there.

The DX could be as simple as:

defang cd status

and then getting:

4 builds currently in queue

Or it could be more like my proposal in the other issue and provide something like:

Start by reviewing the existing defang cd status entry point and the related issue 169. Clarify whether the command should report queue counts, runner information, build history, or the proposed per-service table; done should provide an agreed, observable view of queued and running builds.