Freezer API

Build from the repository root:

docker build -f freezer-api/Dockerfile \
  --build-arg BASE_VENV_BUILDER=quay.io/airshipit/venv_builder:local \
  --build-arg BASE_RUNTIME=quay.io/airshipit/base:local \
  -t quay.io/airshipit/freezer-api:local \
  .