Ship a drag-to-Applications installer instead of a zip

The Desktop artefact is now Work-<version>.dmg rather than a zip: an
installer is what someone expects to be handed, rather than a bare bundle
to file away themselves. Same single build behind both destinations.

scripts/ship.sh

@@ -3,7 +3,7 @@
 # Build once, then put the result in both places, every time:
 #
 #   /Applications/Work.app          the copy being tested here
-#   ~/Desktop/Work-<version>.zip    the copy to send someone else
+#   ~/Desktop/Work-<version>.dmg    the installer to send someone else
 #
 # One build, two destinations — so the thing a tester runs is byte for byte the
 # thing that was just tested here, rather than a second build that drifted.
@@ -14,10 +14,10 @@ APP="Work.app"
 BUILT="src-tauri/target/release/bundle/macos/$APP"
 DEST="/Applications/$APP"
 VERSION="$(node -p "require('./package.json').version")"
-ZIP="$HOME/Desktop/Work-$VERSION.zip"
+DMG="$HOME/Desktop/Work-$VERSION.dmg"
 
 echo "==> building $VERSION"
-npm run tauri build -- --bundles app
+npm run tauri build -- --bundles app,dmg
 
 echo "==> quitting the running copy"
 osascript -e 'quit app "Work"' >/dev/null 2>&1 || true
@@ -32,12 +32,17 @@ echo "==> installing to $DEST"
 rm -rf "$DEST"
 cp -R "$BUILT" "$DEST"
 
-# ditto rather than zip: it keeps the bundle's symlinks and resource forks,
-# which a plain zip mangles into an app that will not open on the other end.
-echo "==> packaging to $ZIP"
-rm -f "$ZIP"
-ditto -c -k --sequesterRsrc --keepParent "$BUILT" "$ZIP"
+# The disk image the bundler just made — drag-to-Applications, which is what
+# someone expects to be handed rather than a bare bundle to file themselves.
+echo "==> copying the installer to $DMG"
+BUILT_DMG="$(find src-tauri/target/release/bundle/dmg -name '*.dmg' -maxdepth 1 | head -1)"
+if [ -z "$BUILT_DMG" ]; then
+  echo "no .dmg was produced — check the bundler output above" >&2
+  exit 1
+fi
+rm -f "$DMG"
+cp "$BUILT_DMG" "$DMG"
 
 echo "==> launching"
 open "$DEST"
-echo "==> done — $DEST and $ZIP"
+echo "==> done — $DEST and $DMG"