Build of dmg is skipped in debug builds, use correct release-dmg target

Author: xor-gate

.github/workflows/build-syncthing-macos-debug-dmg-on-demand.yml

@@ -0,0 +1,23 @@
+name: Build Syncthing macOS unnotarized Release DMG (On-Demand)
+
+on:
+  workflow_dispatch:
+
+jobs:
+  build-release-dmg:
+    name: Build unnotarized Release DMG
+    runs-on: macos-12
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Build release target
+        run: |
+          make release-dmg
+
+      - name: Archive artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: syncthing-macos-dmg-release-dmg
+          path: Build/Products/Release/*.dmg