Running openapi-generator-cli onb a closed corporate network with a maven mirror

Description

I am trying to run the OpenAPI generator CLI using npm but it complains that it cannot reach search.maven.org:

Command I am running in node cmd:

npx @openapitools/openapi-generator-cli generate -i .\fail.oas.yaml -g ruby -o .\temp

Error I am getting:

Unable to query repository, because of: "getaddrinfo ENOTFOUND search.maven.org"

It seems like the tool is trying to access public maven, but I'm on a closed network with no internet. We do have a mirrored of maven which I can access, but how do I tell the tooling to look there instead?

Any help would be massively appreciated!

openapi-generator version

OpenAPI declaration file content or url

Command line used for generation

npx @openapitools/openapi-generator-cli generate -i .\fail.oas.yaml -g ruby -o .\temp

Steps to reproduce

Related issues/PRs

Suggest a fix/enhancement

Start by reproducing the npx @openapitools/openapi-generator-cli generate command in a network without public Maven access, using the fail.oas.yaml input and Ruby generator shown in the issue. Trace how the CLI resolves the generator and queries search.maven.org; done means it can use a configured Maven mirror without contacting the public repository.