Stop using Strimzi as base image as it doesn't use STunnel anymore

Signed-off-by: Jakub Scholz <[email protected]>

Dockerfile

@@ -1,15 +1,17 @@
-FROM quay.io/strimzi/kafka:0.41.0-kafka-3.7.0
+FROM registry.access.redhat.com/ubi9/ubi-minimal:latest
 
 LABEL org.opencontainers.image.source=https://github.com/scholzj/zoo-entrance
 LABEL org.opencontainers.image.title="Zoo Entrance"
 LABEL org.opencontainers.image.description="Stunnel proxy for exposing ZooKeeper in Apache Kafka clusters managed by Strimzi operator"
 
 USER root:root
 
-RUN microdnf install -y stunnel
+RUN microdnf update \
+    && microdnf --setopt=install_weak_deps=0 --setopt=tsflags=nodocs install -y stunnel net-tools \
+    && microdnf clean all
 
 ENV STUNNEL_HOME=/opt/stunnel
 RUN mkdir $STUNNEL_HOME && mkdir -p -m g+rw /usr/local/var/run/
 COPY ./stunnel-scripts/ $STUNNEL_HOME
 
-USER 1001
+USER 1001