Multistage dockerfile to install software into an UBI micro image

Dockerfile

ARG MICRODIR=/microdir
ARG PACKAGES_TO_INSTALL="java-17-openjdk-devel"

FROM registry.access.redhat.com/ubi8-micro@sha256:eb4245271537034f69ee336a4a2b31d3fbae4048ec1db53ff89de749c35cf537 AS BASE

FROM registry.access.redhat.com/ubi8@sha256:83c0e63f5efb64cba26be647e93bf036b8d88b774f0726936c1b956424b1abf6 AS BUILD
ARG MICRODIR
ARG PACKAGES_TO_INSTALL
RUN mkdir ${MICRODIR}
COPY --from=BASE / ${MICRODIR}
RUN yum install \
  --installroot ${MICRODIR} \
  --releasever 8 \
  --setop install_weak_deps=false \
  -y \
  ${PACKAGES_TO_INSTALL}
RUN yum clean all \
  --installroot ${MICRODIR}

FROM scratch AS IMAGE
ARG MICRODIR
COPY --from=BUILD ${MICRODIR}/ .