Add a CI step to upload assets on release creation

We haven't had assets generated for releases since v1.29.0,
however some external code depend on them (dlang-community/setup-dlang, namely).
This will fix it and make it less likely to be forgotten in the future.

Tagging version 0.9.22

The third release candidate for 0.9.22

Tagging 0.9.22-rc.2

Tagging version 0.9.22-rc.1

Tagging version 0.9.22-beta.4 - Fixes all known issues scheduled to b…

…e fixed for this release

Tagging version 0.9.22 beta 3 - includes a lot of fixes for the new d…

…ependency resolution algorithm

Tagging version 0.9.22-beta.2

Tagging 0.9.22-beta.1

Tagging v0.9.21