Install tmux for el8/el9 images

[smuzaffar]

@aandvalenzuela , one next update of el8/el9 containers please add tmux too. It is a small package [a] so should not increase the container size too much.

[a]

Installing:
 tmux                                                          x86_64                                                      2.7-3.el8                                                        baseos                                                      315 k
Installing dependencies:
 libevent                                                      x86_64                                                      2.1.8-5.el8                                                      baseos                                                      253 k

[cmsbuild]

A new Issue was created by @smuzaffar Malik Shahzad Muzaffar.

@smuzaffar, @Dr15Jones, @antoniovilela, @rappoccio, @sextonkennedy, @makortel can you please review it and eventually sign/assign? Thanks.

cms-bot commands are listed here

[smuzaffar]

please only add it when we have to re-built these images

[smuzaffar]

FYI @rovere

[rovere]

@smuzaffar thanks!

[smuzaffar]

type el8,el9

[smuzaffar]

tmux is now available inel8 containers