ci: update centos builds

ci/docker/centos8

@@ -2,6 +2,7 @@ ARG BASE=centos:8
 FROM ${BASE} AS yum
 RUN yum install -y \
 	which \
+	bzip2 \
 	git \
 	libarchive \
 	cmake \
@@ -31,7 +32,7 @@ RUN cd /tmp && \
     curl --insecure --location --silent --show-error https://sourceware.org/pub/valgrind/valgrind-3.15.0.tar.bz2 | \
         tar -xj && \
     cd valgrind-3.15.0 && \
-    CC=clang-10 ./configure && \
+    ./configure && \
     make MAKEFLAGS="-j -l$(grep -c ^processor /proc/cpuinfo)" && \
     make install && \
     cd .. && \