put LIBPATH in dockerfile, try using /bin/bash in place of /bin/sh to see if jenkins crash happens

Dockerfile

@@ -9,7 +9,8 @@ PLEX_INSTALL="https://plex.tv/downloads/latest/1?channel=8&build=linux-ubuntu-x8
 PLEX_MEDIA_SERVER_APPLICATION_SUPPORT_DIR="/config/Library/Application Support" \
 PLEX_MEDIA_SERVER_HOME="/usr/lib/plexmediaserver" \
 PLEX_MEDIA_SERVER_INFO_DEVICE=docker \
-PLEX_MEDIA_SERVER_MAX_PLUGIN_PROCS="6"
+PLEX_MEDIA_SERVER_MAX_PLUGIN_PROCS="6" \
+LD_LIBRARY_PATH="/usr/lib/plexmediaserver:$LD_LIBRARY_PATH"
 
 # install packages
 RUN \

root/etc/services.d/plex/run

@@ -1,6 +1,8 @@
 #!/usr/bin/with-contenv bash
 
 echo "Starting Plex Media Server."
-exec s6-setuidgid abc /bin/sh -c 'LD_LIBRARY_PATH=/usr/lib/plexmediaserver /usr/lib/plexmediaserver/Plex\ Media\ Server'
+exec \
+	s6-setuidgid abc /bin/bash -c \
+	'/usr/lib/plexmediaserver/Plex\ Media\ Server'