Add build options

[Roemer]

As in discussion https://github.com/devcontainers/spec/discussions/301, I would like to propose a way to add cli arguments to a build command, similar how runArgs add cli arguments to the run command. This is needed for example for overriding the network eg. network=host or for adding additional hosts. There is also a discussion about it over at vscode-remote: https://github.com/microsoft/vscode-remote-release/issues/3545

Unfortunately, build.args is already used for Docker ARGuments so we need to use something else. I am open for naming proposals.

Things I thought about are:

• build.buildArgs
• build.cliArgs
• build.cliOptions
• build.options
• build.commandArgs
• build.commandOptions

[Roemer]

So I should create a proposal markdown file similar to https://github.com/devcontainers/spec/pull/196? Or what did you mean with CLI changes? Can do. That should be in its own PR I suppose.

[samruddhikhandale]

As this was discussed in https://github.com/devcontainers/spec/discussions/301 and has decent amount of upvotes, I believe it should be alright not creating a spec issue (or maybe create one and link it to the discussion)

So I should create a proposal markdown file similar to https://github.com/devcontainers/spec/pull/196?

Said that, it would be great if you can create a similar PR, if the proposal looks good then we can start thinking about the CLI code changes.

// cc @bamurtaugh Feel free to correct my understanding, if needed.

[Roemer]

I created a simple proposal for the spec change: https://github.com/devcontainers/spec/pull/328

[fossum]

@samruddhikhandale any update on this?

[chrmarti]

Updating the property name as agreed on in https://github.com/devcontainers/spec/pull/328.