Update GitHub (Gitea) workflow

.gitea/workflows/gradle.yml

@@ -0,0 +1,39 @@
+name: Java CI with Gradle
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+
+    runs-on: archlinux-latest
+    permissions:
+      contents: read
+
+    steps:
+      - name: Install prerequisite packages
+        run: pacman -Syu --noconfirm && pacman -S --noconfirm git
+
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Build with Gradle Wrapper
+        run: ./gradlew build
+
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: JARs
+          path: build/libs