Install zstd-devel in dist builder image.

zstd is only available in EPEL so we need epel-release too.

Author: khuey

src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile

@@ -12,6 +12,7 @@ RUN sed -i /etc/yum.repos.d/*.repo -e 's!^mirrorlist!#mirrorlist!' \
 RUN sed -i 's/enabled=1/enabled=0/' /etc/yum/pluginconf.d/fastestmirror.conf
 
 RUN yum upgrade -y && \
+    yum install -y epel-release && \
     yum install -y \
       automake \
       bzip2 \
@@ -24,6 +25,7 @@ RUN yum upgrade -y && \
       libedit-devel \
       libstdc++-devel.i686 \
       libstdc++-devel.x86_64 \
+      libzstd-devel.x86_64 \
       make \
       ncurses-devel \
       openssl-devel \