How to publish a .NET Core CLI as a single binary for all 3 platforms from a single OS.

publish-cli.sh

#!/bin/bash

set -e
set -v

dotnet publish -c release -r linux-x64
warp-packer --arch linux-x64 --input_dir cli-app/bin/Release/netcoreapp2.2/linux-x64/publish --exec cli-app --output cli-app/bin/Release/netcoreapp2.2/cli-app-linux

dotnet publish -c release -r osx-x64
warp-packer --arch macos-x64 --input_dir cli-app/bin/Release/netcoreapp2.2/osx-x64/publish --exec cli-app --output cli-app/bin/Release/netcoreapp2.2/cli-app-osx

dotnet publish -c release -r win-x64
warp-packer --arch windows-x64 --input_dir cli-app/bin/Release/netcoreapp2.2/win-x64/publish --exec cli-app.exe --output cli-app/bin/Release/netcoreapp2.2/cli-app-win.exe

warp-packer comes from the Warp project: https://github.com/dgiagio/warp