Add github workflows to build the Linux / Windows binary like scopehal-apps

[bvernoux]

Add github workflows to build the Linux / Windows binary like scopehal-apps
Maybe the best will be to build https://github.com/glscopeclient/scopehal-pico-bridge (and other bridges later) directly in https://github.com/glscopeclient/scopehal-apps CI to have the bridges built with glscopeclient binary in same archive at end ...