Add GitHub Actions workflow to build JAR file

Author: netarcx

.github/workflows/build-jar.yml

@@ -0,0 +1,39 @@
+name: Build Robot Code
+
+on:
+  push:
+    branches: [main]
+    tags: ['v*']
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Java 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Build JAR
+        run: ./gradlew jar
+
+      - name: Upload JAR as workflow artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: robot-jar
+          path: build/libs/*.jar
+
+      - name: Create release
+        if: startsWith(github.ref, 'refs/tags/v')
+        uses: softprops/action-gh-release@v2
+        with:
+          files: build/libs/*.jar