Add Unity catalog docker image

[ebyhr]

Add temporary docker image until Unity catalog publish their image: https://github.com/unitycatalog/unitycatalog

Manual confirmation:

➜  docker-images git:(ebi/unity-catalog) docker run -p 8080:8080 testing/unity-catalog
###################################################################
#  _    _       _ _            _____      _        _              #
# | |  | |     (_) |          / ____|    | |      | |             #
# | |  | |_ __  _| |_ _   _  | |     __ _| |_ __ _| | ___   __ _  #
# | |  | | '_ \| | __| | | | | |    / _` | __/ _` | |/ _ \ / _` | #
# | |__| | | | | | |_| |_| | | |___| (_| | || (_| | | (_) | (_| | #
#  \____/|_| |_|_|\__|\__, |  \_____\__,_|\__\__,_|_|\___/ \__, | #
#                      __/ |                                __/ | #
#                     |___/               v0.2.0-SNAPSHOT  |___/  #
###################################################################


➜  docker-images git:(ebi/unity-catalog) curl http://localhost:8080
Hello, Unity Catalog!%

[ebyhr]

phoenix5 failure will be fixed by #208