Make container image smaller

Additionally removes system-installed pip and cleans DNF cache.

Dockerfile

@@ -1,6 +1,9 @@
 FROM registry.access.redhat.com/ubi8/ubi-minimal:8.5 as base
 
-RUN microdnf install -y --nodocs --setopt install_weak_deps=0 python39-pip
+RUN microdnf install -y --nodocs --setopt install_weak_deps=0 \
+        python39 \
+        python39-pip \
+    && microdnf clean -y all
 
 ENV PYTHONFAULTHANDLER=1 \
     PYTHONHASHSEED=random \
@@ -48,6 +51,8 @@ COPY --from=builder /venv /venv
 RUN set -ex \
     && /venv/bin/pip install --no-cache-dir dist/*.whl \
     && rm -r dist \
+    && microdnf remove -y python39-pip \
+    && microdnf clean -y all \
     # This will allow a non-root user to install a custom root CA at run-time
     && chmod 777 /etc/pki/tls/certs/ca-bundle.crt