Docker build arguments

build.sh

docker build --tag ansible .
docker build --tag ansible --build-arg ANSIBLE_VERSION=2.2.0.0 .

Dockerfile

FROM ubuntu

ARG ANSIBLE_VERSION

RUN \
  apt \
    update \
      --yes \
  && \
  apt \
    install \
      --yes \
      python \
      python-pip

RUN \
  pip \
    install \
      ansible$([ -n "$ANSIBLE_VERSION" ] && echo "==$ANSIBLE_VERSION")