Updated bitbucket pipelines to include docker, and updated pswgcommon pointer

bitbucket-pipelines.yml

@@ -8,14 +8,17 @@ pipelines:
           - pswgcommon/**
           - client-holocore/**
     - step:
-        name: test
-        image: openjdk:11-jdk-slim
+        name: test, build, and deploy
+        image: openjdk:12-jdk-slim
         caches:
           - docker
           - gradle
           - gradlewrapper
         script:
           - ./gradlew test
+          - docker login -u $DOCKER_HUB_USER -p $DOCKER_HUB_PASSWORD
+          - docker build -t $DOCKER_HUB_REPO/holocore:$TAG .
+          - docker push $DOCKER_HUB_REPO/holocore:$TAG
         artifacts:
           - pswgcommon/**
           - client-holocore/**