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Convert gemnasium image to be ubi-micro based

Vasant Tokale requested to merge convert-gemnasium-security-analyzer-2 into master
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What does this MR do?

Refactor the Dockerfile file so that the final image is based on ubi8-micro image.



The Dockerfile was refactored so that the final image is based on ubi8-micro instead of ubi8-minimal. A ubi8 image is used as the build stage. In the build stage a alternate file system is created at the ARG DNF_INSTALL_ROOT location. To start with, the entire file system of ubi8-micro is copied in this location:

COPY --from=initial / ${DNF_INSTALL_ROOT}/

This file system is then used as the destination for installing software required in the final image. ARG DNF_OPTS_ROOT is used to pass options to the dnf commands so the software is installed in alternate location(DNF_INSTALL_ROOT). This location is also used to copy files/directories from local file system and from previous stages as well as for changing file permissions required in the final image.

Once the changes to DNF_INSTALL_ROOT are completed, this file system is copied to the root of the final image based on ubi8-micro. Any changes/installations that cannot be done using alternate paths, such as, composer update, npm install -g yarn etc. are then done in the final image.

What are the relevant issue numbers?

ubi#36 (closed)

Does this MR meet the acceptance criteria?

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