Use shared GitHub actions

Author: slawekjaranowski

.github/workflows/maven.yml renamed to .github/workflows/maven-verify.yml

@@ -15,28 +15,13 @@
 # specific language governing permissions and limitations
 # under the License.
 
-name: Java CI
+name: Verify
 
-on: [push, pull_request]
+on:
+  push:
+  pull_request:
 
 jobs:
   build:
-
-    strategy:
-      matrix:
-        os: [ubuntu-latest, windows-latest, macOS-latest]
-      fail-fast: false
-
-    runs-on: ${{ matrix.os }}
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v1
-
-      - name: Set up JDK 1.8
-        uses: actions/setup-java@v1
-        with:
-          java-version: 1.8
-
-      - name: Build with Maven
-        run: mvn install -e -B -V --no-transfer-progress -P run-its
+    name: Verify
+    uses: apache/maven-gh-actions-shared/.github/workflows/maven-verify.yml@v2