build: disable ceph-iscsi repository

The ceph-iscsi repository seems to provide broken metadata or packages.
Ceph-CSI does not need to install them, so disable the repository for
now.

It seems that other repositories gave issues before too, but these
repositories were disabled after installing all available updates. For
ceph-iscsi updating fails already, so disable the repositories before
updating.

Updates: #2034
Signed-off-by: Niels de Vos <ndevos@ibm.com>

deploy/cephcsi/image/Dockerfile

@@ -4,6 +4,11 @@ ARG BASE_IMAGE
 
 FROM ${BASE_IMAGE} as updated_base
 
+# TODO: remove the following cmd, when issue
+# https://github.com/ceph/ceph-container/issues/2034 is fixed.
+RUN dnf config-manager --disable \
+    tcmu-runner,tcmu-runner-source,tcmu-runner-noarch,ceph-iscsi || true
+
 RUN dnf -y update \
        && dnf clean all \
        && rm -rf /var/cache/yum
@@ -29,11 +34,6 @@ RUN source /build.env && \
 # test if the downloaded version of Golang works (different arch?)
 RUN ${GOROOT}/bin/go version && ${GOROOT}/bin/go env
 
-# TODO: remove the following cmd, when issue
-# https://github.com/ceph/ceph-container/issues/2034 is fixed.
-RUN dnf config-manager --disable \
-    tcmu-runner,tcmu-runner-source,tcmu-runner-noarch || true
-
 RUN dnf -y install --nodocs \
 	librados-devel librbd-devel \
 	/usr/bin/cc \