Added Enforce manifest using mt.exe into Installer build script

.forgejo/workflows/Installer_Windows-AMD64-Nightly.yaml

@@ -25,6 +25,11 @@ jobs:
         run: |
           magick -version
 
+      - name: Check mt.exe availability
+        shell: bash
+        run: |
+          mt.exe /? > /dev/null 2>&1 || { echo "mt.exe not available, please install the Windows SDK"; exit 1; }
+
       - name: Clone Publisher repo and Generate Manifest Files
         shell: bash
         run: |
@@ -65,6 +70,8 @@ jobs:
           # Build the installer; resource.syso is automatically linked.
           CGO_ENABLED=1 CC=x86_64-w64-mingw32-gcc GOOS=windows GOARCH=amd64 \
             go build -ldflags "-s -w" -o spitfire-installer.exe
+          # Enforce manifest using mt.exe
+          mt.exe -manifest app.manifest -outputresource:spitfire-installer.exe\;#1
           # Move the built executable one level up for packaging.
           mv spitfire-installer.exe ..
           cd ..