Update base image to pass security scans

build/Dockerfile

@@ -1,14 +1,21 @@
 FROM quay.io/openshift/origin-ansible-operator:4.12
 
+# temporarily switch to root user to adjust image layers
 USER 0
 # Upstream CI builds need the additional EPEL sources for python3-passlib and python3-bcrypt but have no working repos to install epel-release
 # NO_PROXY is undefined in upstream CI builds, but defined (usually blank) during openshift builds (a possibly brittle hack)
 RUN bash -c -- 'if [ "${NO_PROXY:-__ZZZZZ}" == "__ZZZZZ" ]; then echo "Applying upstream EPEL hacks" && echo -e "-----BEGIN PGP PUBLIC KEY BLOCK-----\n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\nzKK4OjJ644NDcWCHa36znwVmkz3ixL8Q0auR15Oqq2BjR/fyog==\n=84m8\n-----END PGP PUBLIC KEY BLOCK-----" > /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-8 && echo -e "[epel]\nname=Extra Packages for Enterprise Linux 8 - \$basearch\nmetalink=https://mirrors.fedoraproject.org/metalink?repo=epel-8&arch=\$basearch&infra=\$infra&content=\$contentdir\nenabled=1\ngpgcheck=1\ngpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-8" > /etc/yum.repos.d/epel.repo; fi'
 
-# Required for oauth-proxy
-RUN dnf install -y python3-passlib python3-bcrypt
+# update the base image to allow forward-looking optimistic updates during the testing phase, with the added benefit of helping move closer to passing security scans.
+# -- excludes ansible so it remains at 2.9 tag as shipped with the base image
+# -- installs python3-passlib and python3-bcrypt for oauth-proxy interface
+# -- cleans up the cached data from dnf to keep the image as small as possible
+RUN dnf update -y --exclude=ansible* && dnf install -y python3-passlib python3-bcrypt && dnf clean all && rm -rf /var/cache/dnf
+
+# switch back to user 1001 when running the base image (non-root)
 USER 1001
 
+# copy in required artifacts for the operator
 COPY watches.yaml ${HOME}/watches.yaml
 COPY roles/ ${HOME}/roles/
 COPY collections/ ${HOME}/.ansible/collections/