Add a gh workflow to upload the release asset

.github/workflows/upload-release-asset.yml

@@ -0,0 +1,30 @@
+on:
+  push:
+    # Sequence of patterns matched against refs/tags
+    tags:
+    - '[0-9]+.[0-9]+.[0-9]+' # Push events to matching release tags, i.e. 0.8.1
+
+name: Upload Release Asset
+
+jobs:
+  build:
+    name: Upload Release Asset
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up JDK 8
+      uses: actions/setup-java@v3
+      with:
+        java-version: '8'
+        distribution: 'temurin'
+        cache: maven
+    - name: Build with Maven
+      run: mvn -B package --file pom.xml
+
+    - name: Upload release asset
+      uses: softprops/action-gh-release@v1
+      with:
+        draft: false
+        prerelease: false
+        files: ./target/dtbook-schema_*_all.deb
+