set up continuous delivery

[zadykian]

solution

• add version tag to AppHost.csproj file

github actions
include following steps into pipeline (on merge to master branch):

• version check (don't publish if version didn't change since last release)

• dotnet publish:

• self-contained --self-contained=true

• app-trimming -p:PublishTrimmed=True [-p:TrimMode=Link]

• single-file publish -p:PublishSingleFile=true

• create zip archives for each OS (win, mac, linux) with following files:

• executable

• appsettings.json

• include artifacts into release