feat: implementiere Cross-Packaging für Windows-MSI via Conveyor auf Linux

Signed-off-by: StefanMoCoAt <stefan.mo.co@gmail.com>

.gitea/workflows/feature-build.yml

@@ -1,4 +1,4 @@
-name: Feature Build — Windows MSI
+name: Feature Build — Windows MSI (via Conveyor)
 on:
   push:
     branches: [ "feature/*" ] # Reagiert auf alle Feature-Branches
@@ -8,7 +8,7 @@ jobs:
     name: 📦 Windows .msi Packaging
     # Nur ausführen, wenn Desktop-CI explizit aktiviert ist
     if: ${{ vars.DESKTOP_CI_ENABLED == 'true' }}
-    runs-on: windows-latest
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -18,27 +18,26 @@ jobs:
         with:
           distribution: 'temurin'
           java-version: '21'
+          cache: gradle
 
-      - name: Gradle cache
-        uses: actions/cache@v4
-        with:
-          path: |
-            ~/.gradle/caches
-            ~/.gradle/wrapper
-            .gradle
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties', 'gradle.properties') }}
-          restore-keys: |
-            ${{ runner.os }}-gradle-
-
-      - name: Windows .msi bauen
-        env:
-          _JAVA_OPTIONS: -Djava.awt.headless=true
+      - name: Gradle Build (Uber-JAR)
         run: |
-          ./gradlew :frontend:shells:meldestelle-desktop:packageMsi --stacktrace --no-daemon
+          ./gradlew :frontend:shells:meldestelle-desktop:jvmJar --no-daemon
+
+      - name: Setup Conveyor
+        run: |
+          curl -s https://conveyor.hydraulic.dev/install.sh | sh
+          echo "$HOME/.conveyor/bin" >> $GITHUB_PATH
+
+      - name: Windows .msi mit Conveyor bauen
+        run: |
+          # Conveyor baut das MSI direkt auf Linux
+          # Wir nutzen --unpinned, um keine festen Versionen zu erzwingen
+          conveyor make windows-msi
 
       - name: .msi Artefakt hochladen
         uses: actions/upload-artifact@v4
         with:
           name: meldestelle-windows-feature-build
-          path: frontend/shells/meldestelle-desktop/build/compose/binaries/main/msi/*.msi
-          if-no-files-found: warn
+          path: output/*.msi
+          if-no-files-found: error