fix(dbt-doc): Allow copying asset when dbt docs command is run outside th…

[cedric-orange]

Resolves #9308

Problem

The directory assets is not being copied to target/assets when running dbt docs generate if you are not in root dbt project.

Solution

Add dbt_project_dir to asset path

Note: I added a devcontainer.json file to have quickly a full-featured development environment

Checklist

• I have read the contributing guide and understand what's expected of me.
• I have run this code in development, and it appears to resolve the stated issue.
• This PR includes tests, or tests are not required or relevant for this PR.
• This PR has no interface changes (e.g., macros, CLI, logs, JSON artifacts, config files, adapter interface, etc.) or this PR has already received feedback and approval from Product or DX.

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[cedric-orange]

Before correction, when running dbt docs generate --project-dir myproject assets are missing in target output.

After this fix: there is now a directory on target output containing assets.

[dataders]

thanks for the PR @cedric-orange! You're right that it's a small change.

Two requests:

1. remove the .devcontainer/devcontainer.json file you've added
2. if possible add a unit test to ensure we don't break this behavior in future releases. Fix using project-dir with list command and path selector #8388 contains a test that Doug thinks would get you most of the way but needs some tweaking

Looking at the linked issue, there was a unit

[cedric-orange]

Thanks for the review, I added a new test according to this topic.

I also remove devcontainer.json file.
I think it would be a good idea to provide a ready-to-use devcontainer for dbt-core.
Do I open another PR with that, or you disagree with it ?