HADOOP-19661. (Follow-up) Install EPEL before installing other packages (#7938) Contributed by Cheng Pan.

* HADOOP-19661. (Follow-up) Install EPEL before installing other packages 

Reviewed-by: Gautham B A <gautham.bangalore@gmail.com>
Signed-off-by: Shilun Fan <slfan1989@apache.org>

Author: pan3793

dev-support/docker/Dockerfile_rockylinux_8

@@ -30,6 +30,11 @@ COPY pkg-resolver pkg-resolver
 RUN chmod a+x pkg-resolver/*.sh pkg-resolver/*.py \
     && chmod a+r pkg-resolver/*.json
 
+####
+# Install EPEL
+####
+RUN pkg-resolver/install-epel.sh rockylinux:8
+
 ######
 # Install packages from yum
 ######
@@ -38,11 +43,6 @@ RUN yum update -y \
     && yum install -y python3 \
     && yum install -y $(pkg-resolver/resolve.py rockylinux:8)
 
-####
-# Install EPEL
-####
-RUN pkg-resolver/install-epel.sh rockylinux:8
-
 RUN dnf --enablerepo=powertools install -y \
     doxygen \
     snappy-devel \