simplify gh actions, add dependabot and release drafter

Signed-off-by: olivier lamy <olamy@apache.org>

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "maven"
+    directory: "/"
+    schedule:
+      interval: "daily"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/release-drafter.yml

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+_extends: .github
+tag-template: versions-maven-plugin-$NEXT_MINOR_VERSION

.github/workflows/maven.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: GitHub CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+        java: [8, 11, 14, 15, 16, 17-ea]
+        jdk: [adopt, zulu]
+      fail-fast: false
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set up cache for ~./m2/repository
+        uses: actions/cache@v2.1.5
+        with:
+          path: ~/.m2/repository
+          key: maven-${{ matrix.os }}-java${{ matrix.java }}-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            maven-${{ matrix.os }}-java${{ matrix.java }}-
+            maven-${{ matrix.os }}-
+
+      - name: Set up JDK
+        uses: actions/setup-java@v2.1.0
+        with:
+          distribution: ${{ matrix.jdk }}
+          java-version: ${{ matrix.java }}
+
+      - name: Build with Maven
+        run: mvn verify -e -B -V -P run-its javadoc:javadoc site site:stage

.github/workflows/release-drafter.yml

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+name: Release Drafter
+on:
+  push:
+    branches:
+      - master
+jobs:
+  update_release_draft:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: release-drafter/release-drafter@v5.15.0
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}