Add latest tag to docker image during build

Author: dhui

docker-deploy.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
 
 echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin && \
-docker build --build-arg VERSION="$TRAVIS_TAG" . -t migrate/migrate:"$TRAVIS_TAG" && \
+docker build --build-arg VERSION="$TRAVIS_TAG" . -t migrate/migrate -t migrate/migrate:"$TRAVIS_TAG" && \
 docker push migrate/migrate:"$TRAVIS_TAG" && docker push migrate/migrate