Start using Github Actions for builds, stop using Travis-CI (#8)

* Start using Github Actions for builds

* Resolve duplicate 'run' key issue

* Use JDK 1.8

* Use the 'adopt' java distribution

* Use Java 8

* Rename the job, reorder steps

* Stop using Travis-CI

.github/workflows/maven.yml

@@ -0,0 +1,29 @@
+# This workflow will build a Java project with Maven
+# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven
+
+name: Build and test openaire-cris-validator
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Checkout the OpenAIRE Guidelines for CRIS Managers repo
+      run: git clone --branch=master https://github.com/openaire/guidelines-cris-managers.git ../guidelines-cris-managers
+    - name: Set up JDK 8
+      uses: actions/setup-java@v2
+      with:
+        java-version: '8'
+        distribution: 'adopt'
+    - name: Build with Maven
+      run: mvn package -Dmaven.javadoc.skip=true -B -V
+    - name: Run the validator on the example files
+      run: java -jar target/openaire-cris-validator-*-jar-with-dependencies.jar file:samples/