add github actions ci and dependabot.

.github/dependabot.yml

@@ -0,0 +1,27 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+version: 2
+updates:
+  - package-ecosystem: "maven"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    target-branch: "master"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    target-branch: "master"

.github/workflows/build.yml

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+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Java CI
+
+on: [ push ]
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    continue-on-error: ${{ matrix.experimental }}
+    strategy:
+      matrix:
+        os: [ ubuntu-latest , windows-latest , macos-latest ]
+        java: [ 8, 11, 14 ]
+        experimental: [ false ]
+
+    steps:
+      - uses: actions/[email protected]
+      - uses: actions/cache@v2
+        with:
+          path: ~/.m2
+          key: ${{ runner.os }}-gradle-m2-${{ hashFiles('**/build.gradle') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+      - uses: actions/cache@v2
+        with:
+          path: ~/.gradle/caches/
+          key: ${{ runner.os }}-gradle-caches-${{ hashFiles('**/build.gradle') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+      - uses: actions/cache@v2
+        with:
+          path: ~/.gradle/wrapper/
+          key: ${{ runner.os }}-gradle-wrapper-${{ hashFiles('**/build.gradle') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+      - name: Set up JDK ${{ matrix.java }}
+        uses: actions/[email protected]
+        with:
+          java-version: ${{ matrix.java }}
+      - name: Build Build Build!
+        run: |
+          mvn install