lock version number in "dnf install"

RHEL 9.0 ships haproxy-2.4.7, RHEL 9.1 will ship haproxy-2.4.17. It's
possible future RHEL 9 versions will have further version rebases.

Add a check to verify that microdnf has installed the version number
that corresponds to the number in the "version" LABEL.

With this change, we will fail the container image build instead of
accidentally installing a newer version that does not match our LABEL.

Author: ktdreyer

Dockerfile

@@ -2,7 +2,8 @@ FROM registry.redhat.io/ubi9/ubi-minimal:latest
 
 RUN microdnf update -y
 
-RUN microdnf install -y haproxy
+# If you edit this version number, edit it here *and* the LABEL below:
+RUN microdnf install -y haproxy && rpm -q haproxy-2.4.17
 
 LABEL maintainer="Guillaume Abrioux <[email protected]>"
 LABEL com.redhat.component="rhceph-haproxy-container"