Fix docker image publishing

[mattsse]

Issue summary

• The Publish Tagged Docker Image step in the ci currently fails with

#!/bin/bash -eo pipefail
IMAGE_TAG=${CIRCLE_TAG/v/''}
docker tag $IMAGE_NAME:latest $IMAGE_NAME:$IMAGE_TAG
docker push $IMAGE_NAME:latest
docker push $IMAGE_NAME:$IMAGE_TAG
Error parsing reference: "chainsafe/pint:" is not a valid repository/tag: invalid reference format

Exited with code exit status 1
CircleCI received exit code 1

Other information and links

• I think the expected tag has this format $DOCKER_REGISTRY_URL/$APPLICATION_NAME:$IMAGE_VERSION_DEV;, so perhaps only the version is missing

[clearloop]

This is fixed in #61