added centos7 base image definition. (#37)

noting this is a minimal first step to base the CI setup needed for weekly images.
UWIT-IAM · Nov 1, 2023 · 455d0de · 455d0de
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diff --git a/images/centos7/Dockerfile b/images/centos7/Dockerfile
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+FROM centos:centos7
+
+LABEL org.opencontainers.image.vendor="UW-IT" \
+      org.opencontainers.image.authors="Justin Prosser"
+
+# dump out container image details for the logs
+RUN echo "hello centos (amd64, arm64, ppc64)"
+RUN echo -n "current OS is: "; uname -p
+
+# Pull latest CentOS 7 updates
+RUN yum update -y
+RUN yum erase -y linux-firmware
+RUN yum clean all
+RUN localedef -i en_US -f UTF-8 en_US.UTF-8
+
+CMD uname -a && sleep infinity
diff --git a/images/centos7/README.md b/images/centos7/README.md
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+# Cent OS 7 base image
+
+This the IAM CentOS 7 base image providing a weekly(?) updated base to build containers from.
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		# Cent OS 7 base image

		This the IAM CentOS 7 base image providing a weekly(?) updated base to build containers from.