Set user-agent and package version

The openapi-generator has a parameter to specify the default UserAgent
for the generated code so we don't have to duplicate the metal-go UA in
client projects.

The generator also supports a package version parameter, but the value
only gets written to the API.md doc, so client projects can't read the
version.

API.md

@@ -87,7 +87,7 @@ To exclude resources, and optimize response delivery, use the `exclude` query pa
 This API client was generated by the [OpenAPI Generator](https://openapi-generator.tech) project.  By using the [OpenAPI-spec](https://www.openapis.org/) from a remote server, you can easily generate an API client.
 
 - API version: 1.0.0
-- Package version: 1.0.0
+- Package version: 0.7.0
 - Build package: org.openapitools.codegen.languages.GoClientCodegen
 
 ## Installation

Makefile

@@ -18,6 +18,7 @@ GIT_ORG=equinix-labs
 GIT_REPO=metal-go
 PACKAGE_PREFIX=metal
 PACKAGE_MAJOR=v1
+PACKAGE_VERSION=0.7.0
 CRI=docker # nerdctl
 
 OPENAPI_GENERATOR=${CRI} run --rm -u ${CURRENT_UID}:${CURRENT_GID} -v $(CURDIR):/local ${OPENAPI_IMAGE}
@@ -59,7 +60,9 @@ clean:
 gen:
 	${OPENAPI_GENERATOR} generate -g go \
 		--package-name ${PACKAGE_MAJOR} \
+		--http-user-agent "${GIT_REPO}/${PACKAGE_VERSION}" \
 		-p isGoSubmodule=true \
+		-p packageVersion=${PACKAGE_VERSION} \
 		--model-package types \
 		--api-package models \
 		--git-user-id ${GIT_ORG} \