Specify testpypi environment

[ngoldbaum]

No description provided.

[timkpaine]

It is not broken, it works fine. The testpypi upload part does not work though:

Notice: Attempting to perform trusted publishing exchange to retrieve a temporary short-lived API token for authentication against https://test.pypi.org/legacy due to __token__ username with no supplied password field
Error: Trusted publishing exchange failure: 
Token request failed: the server refused the request for the following reasons:

* `invalid-publisher`: valid token, but no corresponding publisher (All lookup strategies exhausted)

This generally indicates a trusted publisher configuration error, but could
also indicate an internal error on GitHub or PyPI's part.


The claims rendered below are **for debugging purposes only**. You should **not**
use them to configure a trusted publisher unless they already match your expectations.

If a claim is not present in the claim set, then it is rendered as `MISSING`.

* `sub`: `repo:Point72/csp:ref:refs/tags/v0.0.1`
* `repository`: `Point72/csp`
* `repository_owner`: `Point72`
* `repository_owner_id`: `112506536`
* `job_workflow_ref`: `Point72/csp/.github/workflows/build.yml@refs/tags/v0.0.1`
* `ref`: `refs/tags/v0.0.1`

[ngoldbaum]

I didn't see that you had pushed another tag. Glad to see the action we were using does work. I think using the gh cli is a little simpler to understand, but reverted part of this PR.

Perhaps the changes here are needed? The docs mention needing to specify an environment. You might also have to set up a deployment environment in the repo settings.

[ngoldbaum]

Closing in favor of #105