Add a target to generate the equivalent Dockerfile for a given project

[baronfel]

As part of the 'grow up' story for the tool, it would be great if there was a way to scaffold out the Dockerfile equivalent of what we do in the Task. That would give folks an opinionated base to start any customizations from.

[seesharprun]

This is an amazing suggestion. There are some environments (including Cloud Shell) where you don't have an active Docker host. Being able to generate a Dockerfile enables us to build the container image using tools like Azure Container Registry and az acr build.

Today, the tmds/build-image project gets close, but it has some extra commands that require BuildKit.

[baronfel]

@tmds' project is awesome, by the way :) I'm very excited to see so much containerization energy in the .NET ecosystem right now!

Integration with other tools is a great additional use case for this issue. Docker Compose for example doesn't know anything about MSBuild and so cannot reasonably publish and use your container inside docker compose up. If we could emit a Dockerfile (even if it was in gitignore and never commited) that makes it easy to integrate.

[tmds]

Today, the tmds/build-image project gets close, but it has some extra commands that require BuildKit.

@seesharprun if you create a ticket at https://github.com/tmds/build-image/issues I'll look into it.

[mehdihadeli]

This a helpful thing, if we have an option for exporting docker file beside of publish a docker image

[baronfel]

@mehdihadeli are you interested in potentially contributing it? I'd be happy to walk you through the process.

[tmds]

tmds/build-image project gets close, but it has some extra commands that require BuildKit.

I've made some improvements to https://github.com/tmds/build-image. By specifying the --portable flag you can create a Dockerfile that doesn't depend on BuildKit. I've also aligned the property names with those used by sdk-container-builds.

dotnet tool install -g dotnet-build-image
dotnet new web -o web
cd web
dotnet build-image --portable --as-file Dockerfile