Include distributed docker-compose example

[zalegrala]

Without this change, there is not an example of how a user might proceed with
local testing and development using docker-compose. Here we copy the local
docker-compose example and extend it to include the distributed configuration
pieces necessary to get a functional example.

Fixes #746

Checklist

• Documentation added
• CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX]

[annanay25]

Nice work @zalegrala! Added a few comments.

[zalegrala]

Thanks for the review! I believe I addressed the comments, except for the distributed dashboards testing.

[yvrhdn]

I just noticed we are missing the compactor 😳
The compactor is a required component to run Tempo long-term: https://grafana.com/docs/tempo/latest/operations/architecture/

And I querying the local backend doesn't seem to work well. I can successfully query a trace ID for about 10 minutes and then I get "trace not found". So I believe this matches with when the ingesters flush their blocks to the backend.
As long as the block lives on the ingester, the querier can query the ingesters to find the trace. But once the block is flushed and deleted, the querier has to find it in the backend. I guess something is going wrong while flushing...

[zalegrala]

Thanks for the review. This is looking pretty stable now that minio is in use.

[annanay25]

LGTM. Nice work @zalegrala 🚀

[yvrhdn]

LGTM 🙂 Just some small details left to straighten out. The example works as expected and it's a welcome addition!

[yvrhdn]

LGTM, nice work. This will be very useful 🙂