Added missing macdeployqt step

+ use macdeployqt to create the DMG

.github/workflows/osx.yml

@@ -23,11 +23,8 @@ jobs:
       - name: Build project
         run: make -j3
       - name: Create DMG
-        run: |
-          mkdir GPXSee-master
-          mv GPXSee.app GPXSee-master
-          hdiutil create -srcfolder GPXSee-master GPXSee-master.dmg
+        run: macdeployqt GPXSee.app -dmg
       - name: Upload artifacts
         uses: actions/upload-artifact@v2
         with:
-          path: GPXSee-master.dmg
+          path: GPXSee.dmg