Quarkus + Resteasy + Google Cloud Functions: status code alway 200 no matter what

[HardNorth]

Describe the bug
I'm trying to implement a simple service using Google Cloud Functions and Quarkus. But if I'm trying to return any status except 200, I will always get 200. E.G.:

	@GET
	@Path("error")
	@Produces(MediaType.TEXT_PLAIN)
	public Response error(@Context UriInfo uriInfo) {
		String uriStr = uriInfo.getBaseUri().toString() + uriInfo.getPath(true) + uriInfo.getQueryParameters();
		return Response.status(Response.Status.BAD_REQUEST)
				.encoding("UTF-8")
				.entity(uriStr + "\nmy error").build();
	}

Expected behavior
Status code 400

Actual behavior
Status code 200

To Reproduce
I've implemented a very small test service to reproduce the issue:
https://github.com/HardNorth/quarkus-google-functions-test/blob/main/src/main/java/net/hardnorth/test/quarkus/QuarkusTestService.java

You need to deploy it into Google Cloud. Because it works locally.

Configuration
Doesn't matter at all

Additional context
Based on what I see from code there is a missing part in QuarkusHttpFunction.java. E.G. for Amazon lambdas you bypass status and reason phrase explicitly:
https://github.com/quarkusio/quarkus/blob/master/extensions/amazon-lambda-rest/runtime/src/main/java/io/quarkus/amazon/lambda/http/LambdaHttpHandler.java#L91

But there is no such logic for Google Functions (you convert only headers):
https://github.com/quarkusio/quarkus/blob/master/extensions/google-cloud-functions-http/runtime/src/main/java/io/quarkus/gcp/functions/http/QuarkusHttpFunction.java#L145

[quarkus-bot]

/cc @loicmathieu