Switch to CentOS stream9 builder

hack/build/bazel-build-builder.sh

@@ -36,3 +36,5 @@ if ! git diff-index --quiet HEAD~1 hack/build/docker; then
 
     docker push ${UNTAGGED_BUILDER_IMAGE}:${BUILDER_TAG}
 fi
+
+

hack/build/docker/builder/Dockerfile

@@ -1,20 +1,14 @@
-FROM registry.fedoraproject.org/fedora-minimal:33
+FROM quay.io/centos/centos:stream9
 MAINTAINER "The KubeVirt Project" <kubevirt-dev@googlegroups.com>
 
-COPY fedora.repo /tmp/fedora_ci.dnf.repo
-
-RUN sed -i 's/proxy = None//gI' /tmp/fedora_ci.dnf.repo && \
-	cat /tmp/fedora_ci.dnf.repo && \
-	mkdir /etc/yum.repos.d/old && \
-	mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/old  && \
-	mv /tmp/fedora_ci.dnf.repo /etc/yum.repos.d/fedora.repo && \
-	microdnf update -y && microdnf install -y \
+RUN 	dnf -y install dnf-plugins-core && \
+	dnf config-manager --set-enable crb && dnf update -y && \
+	dnf install -y \
 	cpio \
 	diffutils \
 	git \
 	python3-pip \
 	python3-devel \
-	mercurial \
 	gcc \
 	gcc-c++ \
 	glibc-devel \
@@ -30,11 +24,7 @@ RUN sed -i 's/proxy = None//gI' /tmp/fedora_ci.dnf.repo && \
 	nbdkit-devel \
 	unzip \
 	java-11-openjdk-devel \
-	btrfs-progs-devel \
-	device-mapper-devel \
-	&& microdnf clean all && \
-	mv /etc/yum.repos.d/old/* /etc/yum.repos.d/ && \
-	rmdir /etc/yum.repos.d/old
+	&& dnf clean all
 
 RUN pip3 install --upgrade j2cli operator-courier==2.1.11 && \
 	curl -sL https://services.gradle.org/distributions/gradle-6.6-bin.zip -o gradle-6.6-bin.zip && \
@@ -64,6 +54,10 @@ ENV BAZEL_VERSION 3.7.2
 
 RUN curl -L -o /usr/bin/bazel https://github.com/bazelbuild/bazel/releases/download/${BAZEL_VERSION}/bazel-${BAZEL_VERSION}-linux-x86_64 && chmod u+x /usr/bin/bazel
 
+# Until we use a version including the fix for this Bazel issue:
+# https://github.com/bazelbuild/bazel/issues/11554
+RUN ln -s /usr/bin/python3 /usr/bin/python
+
 ADD entrypoint.sh /entrypoint.sh
 ADD entrypoint-bazel.sh /entrypoint-bazel.sh