Enable GitHub CI

.github/workflows/build.yml

@@ -0,0 +1,35 @@
+name: Build
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+
+      - name: Build with Gradle Wrapper
+        run: ./gradlew build
+
+      - name: Prepare artifacts
+        run: unzip build/distributions/*.zip -d build/distributions
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: decima
+          path: build/distributions/*/