Update SDK for new deployment spec

[paf31]

• Use new environment variable names and defaults
• Remove configuration server
• Pass PathBuf to validate_raw_configuration and remove RawConfiguration
• Update Dockerfile to meet the deployment spec

[SamirTalwar]

Approving so it's not blocked, but please consider my comments.

[daniel-chambers]

I'm not sure how easy this is to do, but is it possible to remove this default when compiled for Windows? I know we don't care about deployment on Windows, but theoretically Windows developers may build a connector using this SDK and when they run it locally, it should not default to an impossible path, instead we should prefer to just make them specify this arg manually.

[daniel-chambers]

This also applies to the other commands that have this same parameter: ServeCommand, ReplayCommand

[SamirTalwar]

Hmmm, I think this point is bigger than just Windows vs. Unices.

In a Linux Docker image, we want to read /etc/connector. But when running locally for testing, we want to read the specified directory; we almost never want to use /etc/connector, even on Linux.

I think the right move here is to remove the default value and set ENV HASURA_CONFIGURATION_DIRECTORY /etc/connector in connector Docker images. This can be overridden.

Long story short, the default is a packaging concern, not an SDK concern.

[paf31]

As I think about it, I agree. I'll remove the default and move it to the Dockerfile. For reference, it was possible though:

#[cfg_attr(target_family = "unix", arg(default_value = "/etc/connector"))]

[SamirTalwar]

Let's merge this. Gonna follow up with a change to an error enum but that needs its own review.