Implement pulsar-dev-container

[ottok]

Make it easier for new contributors to get up-and-running quickly by introducing a single script that builds a container with all required dependencies, and allows to easily run any yarn command in the project.

You can test this by running e.g.

./container/pulsar-dev-container.sh
./container/pulsar-dev-container.sh yarn start

Demo:

output.mp4

[savetheclocktower]

Thanks for the contribution!

I'm not a habitual Docker user, so I'm curious if another contributor (@DeeDeeG?) is willing to give more informed feedback on this than I can muster.

[DeeDeeG]

Thank you for taking the time to do all this!

I don't believe the currently active team members are using Docker much, and this would be fairly parallel to the CI definitions we do use. I think it's neat and would be happy to point people to this PR if they need a Docker setup to get started. But the likelihood of maintenance on our side feels low, so putting it in the core repo feels like a "wrong location" thing, IMO. (For bitrot concerns, and due to the lack of a code owner among the long-haul established team who can support and explain it well to potential newcomers).

Just one opinion and open to hearing other voices from core team and potential / current contributors.