Add Red Hat UBI base image for imps-refresher image

[vhosakot]

Q	A
Bug fix?	no
New feature?	no
API breaks?	no
Deprecations?	no
Related tickets	none
License	Apache 2.0

What's in this PR?

imagepullsecrets-refresher container is installed by the smm-operator helm chart and Red Hat certification of Cisco's Calisti 1.12 on OpenShift requires all images installed by the smm-operator helm chart to have Red Hat UBI (Universal Base Image) as the base image and the /licenses directory. So, adding them for imagepullsecrets-refresher image and updated .github/workflows/docker_refresher.yml to build a new imagepullsecrets-refresher image with UBI base image.

Why?

Needed for Red Hat certification of Cisco's Calisti 1.12 on OpenShift.

Additional context

Checklist

• Code meets the Developer Guide

Test results:

docker build . --build-arg FROM_IMAGE=redhat/ubi8-micro  -f Dockerfile-refresher -t testtag/smm/imagepullsecrets-refresher:rh-ubi8

$ docker images
REPOSITORY                               TAG       IMAGE ID       CREATED          SIZE
testtag/smm/imagepullsecrets-refresher   rh-ubi8   ca3be1077a2d   24 seconds ago   75.6MB

# image has Red Hat UBI base image
$ docker inspect ca3be1077a2d | grep -i ubi
            "testtag/smm/imagepullsecrets-refresher:rh-ubi8"
                "com.redhat.component": "ubi8-micro-container",
                "com.redhat.license_terms": "https://www.redhat.com/en/about/red-hat-end-user-license-agreements#UBI",
                "io.k8s.display-name": "Ubi8-micro",
                "name": "ubi8/ubi-micro",
                "summary": "ubi8 micro image",
                "url": "https://access.redhat.com/containers/#/registry.access.redhat.com/ubi8/ubi-micro/images/8.7-8",

# image has /licenses directory with the license
$ docker run --rm -it --entrypoint="/bin/sh" testtag/smm/imagepullsecrets-refresher:rh-ubi8
sh-4.4$ ls -l /licenses/LICENSE.md 
-rw-r--r-- 1 root root 11357 Apr 10 17:03 /licenses/LICENSE.md
sh-4.4$ cat /licenses/LICENSE.md 
sh-4.4$ exit

[vhosakot]

docs about build-args: in GitHub action for docker build:

• Build args  docker/build-push-action#557 (comment)
• https://github.com/docker/build-push-action#inputs

  • build-args | List | List of build-time variables

[tiswanso]

CI licensei error: might need to use v0.8.0 of licensei-- https://github.com/goph/licensei/releases/tag/v0.8.0

currently, the Makefile is using 0.7.0

[vhosakot]

vendoring in deps in CI before checking their licenses per banzaicloud/koperator#853 (comment) to resolve spurious license errors in CI when contacting github.com, thanks to @panyuenlau for this tip.

[vhosakot]

CI licensei error: might need to use v0.8.0 of licensei-- https://github.com/goph/licensei/releases/tag/v0.8.0

currently, the Makefile is using 0.7.0

thanks, vendoring in the deps fixed the error in CI, more info is in #32 (comment)

[tiswanso]

lgtm

[vhosakot]

@Laci21, @waynz0r, can I get this PR merged please if it looks good, thanks.