Update build configuration and increment mod version to 1.0.2

.github/workflows/build_jar.yml

@@ -0,0 +1,35 @@
+name: Build and Upload JAR
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'temurin'
+          java-version: '21'
+
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+
+      - name: Build with Gradle
+        run: ./gradlew build
+
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: build-artifact
+          path: build/libs/*.jar