[actions] Add github action to run entirely through maven 3.3.9

In order to show that plugin is compatible with 3.3.9

.github/workflows/it-maven339.yaml

@@ -0,0 +1,40 @@
+#
+#    Copyright 2011-2020 the original author or authors.
+#
+#    This program is free software; you can redistribute it and/or
+#    modify it under the terms of the GNU General Public License
+#    as published by the Free Software Foundation; either version 2
+#    of the License, or (at your option) any later version.
+#
+#    You may obtain a copy of the License at
+#
+#       https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+
+name: Java Integration Tests
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    name: Integration Tests
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK
+        uses: actions/setup-java@v2
+        with:
+          java-version: 11
+          distribution: 'zulu'
+      - name: Load Maven 3.3.9
+        run: ./mvnw org.apache.maven.plugins:maven-wrapper-plugin:3.1.0 -DmavenVersion=3.3.9
+      - name: Build Setup
+        run: ./mvnw clean install -Dmaven.min-version=3.3.9
+      - name: Integration Test with Maven
+        run: ./mvnw -DtestSrc=remote -Prun-its clean install -Dinvoker.parallelThreads=4