Added CI

.github/workflows/build.yml

@@ -0,0 +1,32 @@
+name: Java CI
+
+on:
+  push:
+    branches:
+      - 'main'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    if: |
+      !contains(github.event.head_commit.message, '[ci skip]')
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Set up JDK 17
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+          cache: gradle
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+      - name: Validate Gradle Wrapper
+        uses: gradle/wrapper-validation-action@v1
+      - name: Build and Publish with Gradle
+        uses: gradle/gradle-build-action@v2
+        env:
+          MAVEN_TOKEN: ${{ secrets.MAVEN_TOKEN }}
+          KARL_TOKEN: ${{ secrets.KARL_TOKEN }}
+        with:
+          arguments: build publish --stacktrace --no-daemon