add DMG builds

.github/workflows/macos.yml

@@ -38,3 +38,15 @@ jobs:
               with:
                   name: Nexus.App
                   path: build/macos/Build/Products/Release/Nexus.app
+
+            - name: Create DMG
+              uses: L-Super/create-dmg-actions@v1
+              with:
+                  dmg_name: nexus.dmg
+                  src_dir: Nexus.app
+
+            - name: Upload installer artifact
+              uses: actions/upload-artifact@v6
+              with:
+                  name: ${{ steps.create-dmg.inputs.path }}
+                  path: ${{ github.workspace }}/${{ steps.create-dmg.outputs.dmg_path }}