Remove Travis, Add github actions script

Author: mizadi

.github/workflows/build.yml

@@ -0,0 +1,42 @@
+name: Kotlin SDK CI with Gradle
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 8
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'oracle'
+          java-version: '8'
+
+      - name: Prepare Cloudinary URL
+        id: cloudinary
+        run: |
+          CLOUDINARY_URL=$(bash tools/get_test_cloud.sh)
+          echo "CLOUDINARY_URL=$CLOUDINARY_URL" >> $GITHUB_ENV
+          echo "cloud_name: $(echo $CLOUDINARY_URL | cut -d'@' -f2)"
+
+      - name: Clean Gradle plugin cache
+        run: |
+          rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
+          rm -fr $HOME/.gradle/caches/*/plugin-resolution/
+
+      - name: Cache Gradle
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+
+      - name: Run tests
+        run: ./gradlew clean test