Fix source to install azure-cli

This commit updates Krkn source Dockerfile to copy azure client binary
from the official azure-cli image instead of using package manager to
avoid dependency issues.

containers/Dockerfile

@@ -2,6 +2,8 @@
 
 FROM quay.io/openshift/origin-tests:latest as origintests
 
+FROM mcr.microsoft.com/azure-cli:latest as azure-cli
+
 FROM quay.io/centos/centos:stream9
 
 LABEL org.opencontainers.image.authors="Red Hat OpenShift Chaos Engineering"
@@ -12,12 +14,13 @@ ENV KUBECONFIG /root/.kube/config
 COPY --from=origintests /usr/bin/oc /usr/bin/oc
 COPY --from=origintests /usr/bin/kubectl /usr/bin/kubectl
 
+# Copy azure client binary from azure-cli image
+COPY --from=azure-cli /usr/local/bin/az /usr/bin/az
+
 # Install dependencies
 RUN yum install epel-release -y && \
     yum install -y git python python3-pip jq gettext && \
     python3 -m pip install -U pip && \
-    rpm --import https://packages.microsoft.com/keys/microsoft.asc && \
-    echo -e "[azure-cli]\nname=Azure CLI\nbaseurl=https://packages.microsoft.com/yumrepos/azure-cli\nenabled=1\ngpgcheck=1\ngpgkey=https://packages.microsoft.com/keys/microsoft.asc" > /etc/yum.repos.d/azure-cli.repo && yum install -y azure-cli && \
     git clone https://github.com/openshift-scale/kraken /root/kraken && \
     mkdir -p /root/.kube && cd /root/kraken && \
     pip3 install -r requirements.txt