Workaround broken google-cloud-sdk update

A package update includes a new bug.  Workaround
https://issuetracker.google.com/issues/209655844 by excluding the
problematic version.

imgts/Containerfile

@@ -2,9 +2,10 @@ FROM quay.io/centos/centos:stream8
 
 # Only needed for installing build-time dependencies
 COPY /imgts/google-cloud-sdk.repo /etc/yum.repos.d/google-cloud-sdk.repo
-RUN yum -y --setopt=keepcache=true update && \
-    yum -y --setopt=keepcache=true install epel-release && \
-    yum -y --setopt=keepcache=true install google-cloud-sdk
+RUN dnf -y --setopt=keepcache=true update && \
+    dnf -y --setopt=keepcache=true install epel-release && \
+    dnf -y --setopt=keepcache=true --exclude=google-cloud-sdk-366.0.0-1 \
+        install google-cloud-sdk
 
 # These all represent required variables which must be set by caller
 ENV GCPJSON="__unknown__" \