Add github workflow to run on each push

Author: A248

.github/workflows/maven.yml

@@ -0,0 +1,32 @@
+name: Java CI
+
+on:
+  push:
+    branches: [ '*' ]
+  pull_request: {}
+
+jobs:
+  build:
+    if: ${{ github.event_name != 'pull_request' || github.repository != github.event.pull_request.head.repo.full_name }}
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Cache Maven packages
+      uses: actions/cache@v2
+      with:
+        path: ~/.m2
+        key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+        restore-keys: ${{ runner.os }}-m2
+    - name: Set up JDK 8 for toolchain
+      id: setup-java8
+      uses: actions/setup-java@v2
+      with:
+        java-version: 8
+        distribution: 'zulu'
+    - name: Set up JDK 16
+      uses: actions/setup-java@v2
+      with:
+        java-version: 16
+        distribution: 'zulu'
+    - name: Build with Maven
+      run: export JAVA8_HOME=${{ steps.setup-java8.outputs.path }} && mvn -B verify -Dgpg.skip=true --global-toolchains .github/workflows/toolchains.xml

.github/workflows/toolchains.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF8"?>
+<toolchains>
+    <toolchain>
+        <type>jdk</type>
+        <provides>
+            <version>1.8</version>
+        </provides>
+        <configuration>
+            <jdkHome>${env.JAVA8_HOME}</jdkHome>
+        </configuration>
+    </toolchain>
+</toolchains>