Adding placeholder publisher client image

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## Docker image for an ESGF publisher client application

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ARG ESGF_REPOSITORY_BASE=esgfdeploy

ARG ESGF_IMAGES_VERSION=latest

ARG GIT_REPOSITORY=https://github.com/ESGF/esg-publisher.git

ARG GIT_VERSION=no-auth

FROM ${ESGF_REPOSITORY_BASE}/python-build:${ESGF_IMAGES_VERSION} as python-build

FROM ${ESGF_REPOSITORY_BASE}/base:${ESGF_IMAGES_VERSION}