[yocto] Modify login prompt with script output

[Donal Morrissey]

Hi There,
Is it possible to modify the login prompt so that it includes the output of
a script?
I know I can modify the /etc/issue file as part of the build to include
custom text, but I would like to have a script which is executed to
generate some text to be displayed as part of the prompt.
Cheers,
Donal
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