[Issue] Surface `docker build` output as part of `azd deploy` output

[savannahostrowski]

Right now, during azd deploy no information is shown around building a docker image. In the template I'm working on, the pip install takes a good while (not an azd problem :D) so this feels like a really long time without any progress (like ~5 mins):

I think it'd be really helpful to be able to see some of the steps happening under the hood. That way, the user is able to see exactly what step it's working on. We could consider surfacing the information in a "window" (similar to what pip install looks like below) to make it clear that this is a subprocess as part of azd deploy.

[vhvb1989]

Adding @Austinauth.

currently, we don't have multi-line temporal log support for outputs. We only have single-line temporal log support.

[Austinauth]

@vhvb1989 Can you explain a little further? I'm not sure what that means.

[savannahostrowski]

@Austinauth Right now, we support single line status/progress (e.g. azd provision; each operation gets it's own line).

As part of azd deploy, we run docker build to build the container image before sending it off to ACR and then using it in the deployment. However, we don't actually show the Docker output as part of the azd deploy command. Instead, the user just sees image 1.

Image 2 is what the user sees if they run docker build outside of azd. This ask is to show users that progress and surface it in azd deploy. Coincidentally, the grey bit in the docker build image is similar to the behaviour I'm talking about. I can also show you when we meet next!