Integrate the Docker Language Server for build checks

[rcjsuen]

The Docker Language Server adds support for build checks through BuildKit. Is Zed able to run two language servers for the same file?

The language server also provides support for Docker Compose and Docker Bake but I don't know if those would be in the scope of this extension or if they should be new extensions.

[notpeter]

Is Zed able to run two language servers for the same file?

Yes Zed can support moultiple LSPs for a single file.

Docker-compose (yaml) and docker-bake (hcl, json, yaml) would also be in scope to be supported by this extension.

[rcjsuen]

Is it correct that it is not possible to arbitrarily define new language servers? I tried this but it did not appear to work.

{
  "languages": {
    "Dockerfile": {
      "language_servers": ["docker-language-server", "dockerfile-language-server"]
    }
  },
  "lsp": {
    "docker-language-server": {
      "binary": {
        "ignore_system_version": true,
        "path": "/path/to/binary",
        "arguments": ["start", "--stdio"]
      }
    }
  }
}

[MrSubidubi]

@rcjsuen Yes, that's correct. We would need to declare support for this here in the extension so that Zed recognized this without issues, similar to how other extensions do this.

[ghuh]

Are there plans to migrate this extension to use the official Docker Language Server as @rcjsuen suggested? It's much better than this extension currently is. The build checks are extremely helpful (I use it through Helix)