Add workflow for drafting releases

.github/workflows/draft-release.yml

@@ -0,0 +1,31 @@
+name: Draft Release
+
+on:
+  release:
+    types: [drafted]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up JDK 17
+      uses: actions/setup-java@v3
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+        cache: maven
+    - name: Build (mvn package)
+      run: mvn -B package --file com.eclipsesource.megit.parent/pom.xml
+    - name: Upload each zip file as a separate asset
+      run: |
+        for zipfile in ./com.eclipsesource.megit.product/target/products/*.zip; do
+          asset_name=$(basename $zipfile)
+          echo "Uploading $asset_name"
+          curl \
+            -X POST \
+            -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+            -H "Content-Type: $(file -b --mime-type $zipfile)" \
+            --data-binary @$zipfile \
+            ${{ github.event.release.upload_url }}?name=$asset_name
+        done