Install required packages for running linperf.sh to gather performance data (#159)

* Install required packages for linperf.sh

* Add comment and parenthesize the package command

Author: kabicin

Dockerfile

@@ -15,6 +15,11 @@ LABEL \
   summary="Sample app running on Open Liberty that uses Eclipse MicroProfile" \
   description="This image contains a sample application that displays the Java system properties and demonstrates MicroProfile Config, Health and Metrics."
 
+# Install required packages to run linperf.sh
+USER 0
+RUN command -v yum && pkgcmd=yum || pkgcmd=microdnf && ($pkgcmd update -y && $pkgcmd install -y procps-ng net-tools ncurses hostname)
+USER 1001
+
 COPY --chown=1001:0 src/main/liberty/config/ /config/
 
 RUN features.sh