Add DMG wrapping to CI

dmg-wrapper/SheepIt-Run.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+set -euo pipefail # Unofficial strict mode, see http://redsymbol.net/articles/unofficial-bash-strict-mode/
+
+cd "$(dirname "$(readlink -f "$0")")"
+# see https://stackoverflow.com/questions/3349105/how-can-i-set-the-current-working-directory-to-the-directory-of-the-script-in-ba
+echo "Please only pin the first window - the launcher to the Dock"
+echo "============================="
+echo "Loading and launching SheepIt"
+nohup "$BIN" -Xdock:icon=./$APP.png -Djna.nosys=true -jar "$JAR" &>/dev/null & disown
+osascript -e 'tell application "Terminal" to close (every window whose name contains "SheepIt-Run.sh")' &
+exit 0