move to circleci

Author: ibalosh

.circleci/config.yml

@@ -0,0 +1,48 @@
+version: 2.1
+
+workflows:
+  java-tests:
+    jobs:
+      - unit-tests:
+          name: java8
+          version: "8"
+      - unit-tests:
+          name: java9
+          version: "9"
+          requires:
+            - java8
+      - unit-tests:
+          name: java10
+          version: "10"
+          requires:
+            - java9
+      - unit-tests:
+          name: java11
+          version: "11"
+          requires:
+            - java10
+      - unit-tests:
+          name: java-latest
+          version: "latest"
+          requires:
+            - java10
+
+jobs:
+  unit-tests:
+    parameters:
+      version:
+        type: string
+    docker:
+      - image: circleci/openjdk:<< parameters.version >>
+    steps:
+      - checkout
+      - run:
+          name: Versions
+          command: |
+            echo "java: $(java -version)"
+      - run:
+          name: Install dependencies
+          command: mvn install -DskipTests=true -Dmaven.javadoc.skip=true -Dgpg.skip=true -B -V
+      - run:
+          name: Run tests
+          command: mvn test