* Add artifact publish step for Windows libraries and host tools.
* Replace runner.workspace with github.workspace.
* Update checkout task to v4 to supress warning.
* Update CMAKE for libhackrf and hackrf-tools to also install DLLs on WIN32 platforms.
* Update uploadartifact task to v4 since v3 uses an end-of-life node version 16.
* Add a new windows variable for the vcpkg cmake toolchain makefile.
We were only setting this to Release, so there is no current need for an
environment variable.
Removing it allows us to reuse some steps for Windows, where the syntax
to insert an environment variable is different.
