Trusted publishing: Support for SemaphoreCI

[cchristous]

What's the problem this feature will solve?

I'd like to be able to publish to pypi from my self hosted SemaphoreCI instance using OIDC.

Describe the solution you'd like

SemaphoreCI already supports OIDC:

• https://docs.semaphore.io/using-semaphore/openid
• https://docs.semaphore.io/reference/openid

I believe it meets the requirements defined on https://docs.pypi.org/trusted-publishers/internals/#how-do-i-become-a-trusted-publishing-provider.

Maybe SaaS support would be a good place to start, but it doesn't benefit my use case.

Additional context