Automated the Creation and Upload of Release Artifacts

[dstufft]

Currently creating release artifacts (sdist, wheel) require certain dependencies to be installed and then they require manually running setup.py sdist, setup.py bdist_wheel, and twine upload -s dist/*. It would be great to automate this so that the artifacts can be created with a single command regardless of what formats we want to support, and then another single command will upload them.

[pradyunsg]

Can we depend on Travis CI and Appveyor for the deployments? If so, it should be possible to upload the artifacts that way...

The password for PyPI can be encrypted and the deploy script can be used to make the upload directly from the CI whenever a new tag is created.

[pradyunsg]

We could adopt a process like numpy? [1]

Build the wheels on CI, upload them to some online storage, download, sign and upload.

This process could be made into a script that performs these steps, needing only input from the releaser only for signing the release - the signing key would be a parameter and gpg would ask for passphrase.

[pradyunsg]

@dstufft ping?

[pradyunsg]

With #7286, the creation of release artifacts has been automated. The upload is still a manual step though.

[pradyunsg]

That's done too now. :)