Add script to generate download links for release

scripts/generate_release_markdown.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+set -eu
+VERSION="$1" # such as 3.7.1, 4.0.0-rc1
+cat <<-MD
+### Mattermost Desktop ${VERSION} has been cut!
+The download links can be found below.
+
+#### Linux
+https://releases.mattermost.com/desktop/${VERSION}/mattermost-desktop-${VERSION}-linux-ia32.tar.gz
+https://releases.mattermost.com/desktop/${VERSION}/mattermost-desktop-${VERSION}-linux-x64.tar.gz
+https://releases.mattermost.com/desktop/${VERSION}/mattermost-desktop-${VERSION}-linux-amd64.deb
+https://releases.mattermost.com/desktop/${VERSION}/mattermost-desktop-${VERSION}-linux-i386.deb
+
+#### Mac
+https://releases.mattermost.com/desktop/${VERSION}/mattermost-desktop-${VERSION}-osx.tar.gz
+
+#### Windows
+https://releases.mattermost.com/desktop/${VERSION}/mattermost-desktop-${VERSION}-win32.zip
+https://releases.mattermost.com/desktop/${VERSION}/mattermost-desktop-${VERSION}-win64.zip
+https://releases.mattermost.com/desktop/${VERSION}/mattermost-setup-${VERSION}-win32.exe
+https://releases.mattermost.com/desktop/${VERSION}/mattermost-setup-${VERSION}-win64.exe
+MD