Add DMG wrapping to CI

dmg-wrapper/SheepIt-Run.sh

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+#!/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

dmg-wrapper/build-libdmg-hfsplus.sh

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+#!/bin/bash
+
+sudo apt-get install git cmake build-essential zlib1g-dev
+
+git clone https://github.com/fanquake/libdmg-hfsplus.git
+cd libdmg-hfsplus
+cmake . -B build
+make -C build/dmg -j8
+mv build/dmg/dmg ..
+cd ..
+rm -rf libdmg-hfsplus/

dmg-wrapper/ci-build-dmg.sh

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+#!/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
+
+ARCH="$1"
+JRETAR="$2"
+
+APP="SheepIt"
+DMG="$APP-$ARCH-raw.dmg"
+FINAL="$APP-$ARCH.dmg"
+
+BASE="$(pwd)"
+BUILD="$BASE/build"
+RES="$BUILD/SheepIt.app/Contents/Resources"
+CL="$RES/client"
+
+apt-get update
+apt-get install -y --no-install-recommends genisoimage  # Add dependencies
+
+mkdir "$BUILD"
+tar -axf "$APP.tar.gz" -C "$BUILD"  # Extract base file structure + Platypus shell exec shim
+tar -axf "$BASE/$JRETAR" -C "$RES"  # Extracts the JRE into Resources folder
+
+mkdir -p "$CL"
+cp ../sheepit-client-all.jar "$CL/$APP.jar"  # Copy client artifact to be packaged
+cp "$BASE/$APP-Run.sh" "$CL"
+cp "$BASE/$APP.png" "$CL"
+
+cd "$CL"
+ln -s "$(find ../ -name java)" $APP  # We symlink java to make the title appearing in the dock to read "SheepIt", not "java"
+cd "$BASE"
+
+genisoimage -D -V $APP -no-pad -r -apple -o "$DMG" "$BUILD"
+./dmg "$DMG" "$FINAL"  # Use libdmg based dmg tool to compress the dmg (and also make it read-only)