Add cross-platform release workflow for Win/Mac/Linux builds#17

Steake merged 3 commits intocopilot/test-qa-bitcell-walletSteake/BitCell:copilot/test-qa-bitcell-walletfrom

copilot/create-build-actions-win-mac-linuxSteake/BitCell:copilot/create-build-actions-win-mac-linuxCopy head branch name to clipboard