feat: add a build job to push the container image to the repo registry

[vordimous]

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[DamascenoRafael]

Hi @vordimous, could you explain how it would work and what the purpose of this workflow is?
I'm not that familiar with docker.

[vordimous]

@DamascenoRafael This code builds the image in the dockerfile and dynamically creates tags based on commits and branches. This config is the default setup that adds published images for people to use instead of manually pulling and building the image. You can see an example of what this will look like on your account by looking at my fork: https://github.com/vordimous/mqtt-simulator/pkgs/container/mqtt-simulator

Here is an example of what people can do to run the simulator: https://github.com/aklivity/zilla-examples/blob/v14/quickstart/docker/compose/docker-compose.yaml#L22

If you merge this code then anyone can use the image ghcr.io/DamascenoRafael/mqtt-simulator instead of doing what I am on the fork.

[vordimous]

I went ahead and updated the dockerfile python version.