litex_setup.py: Disable auto-update of litex_setup for CI #1779
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This adds a new config option to litex_setup (--disable-auto-update) to disable the auto-update mechanism. It further changes the CI flow to use that flag.
Why? The auto-update is a problem for the CI workflow because it will override any (especially branch-specific) changes to the litex_setup script. Then CI is testing the wrong litex_setup script.
This should fix the CI flow for #1776