Misc[docker]: Adding dependency of bmqbrkr to bmqtool in docker-compose.yaml single-node example

[pts95]

*Issue number of the reported bug or feature request: #476 *

Describe your changes
Great project!

Testing the examples listed on the official Getting Started page on a M1 Macbook Pro (darwin/arm64) and I notice the build and example instructions don't work.

Think this is due to two reasons:

1. The project fails to build due to many compiler warnings. Temporarily commenting out -DBDE_BUILD_SAFE=on works.
2. The instructions on starting the bmqtool in the doc link above doesn't work - start fails to connect, because the bmqbrkr is not started. This is probably because bmqtool doesn't depend on bmqbrkr service container - which it should.

This PR fixes the 2nd issue by adding a dependency on bmqbrkr in bmqtool via depends_on. I am still going through how broker health checks work - it should be service_healthy instead, but I couldn't find an easy way to do this in the bmqtool CLI help. So using service_started instead - to only start bmqtool container once

Partially addresses #476

Testing performed
Follow all the steps listed here with workaround suggested in 1 and the depends_on changes in this PR - everything from building and testing the queue should work as intended.

Additional context
N/A. I might make more PRs - this project looks interesting.

[678098]

Hi @pts95, thanks for the PR. It's a good fix
Currently the CI fails because the PR title needs to be changed, so it starts with one of the allowed prefixes. I propose to start the title with Misc[docker]: ... We use these preset prefixes to automatically sort release notes.
Another problem is DCO check. It's a common problem, and we put an instruction what it is and how to fix this fast here: https://github.com/bloomberg/blazingmq/blob/main/CONTRIBUTING.md#dco-check

[pniedzielski]

Thanks for the change! I'm going to let CI run once more to be safe, but looks good to merge in.

[pniedzielski]

Test failure seems unrelated; will look into in a different changeset.