ci: viewer preview build

.github/workflows/preview-build-viewer.yml

@@ -0,0 +1,32 @@
+name: Build a preview version for MarkBook Viewer
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: windows-latest
+    steps:
+
+      - name: Checkout master
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'zulu'
+
+      - name: Build with Gradle
+        run: ./gradlew :markbook-viewer:linkReleaseExecutableMingwX64
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: markbook-viewer-${{ github.sha }}
+          path: markbook-viewer/build/bin/mingwX64/releaseExecutable/markbook-viewer.exe