Add an option to Disable tlmgr automatic updates

[matthewgson]

Hi Yihui,

Following a conversation from: https://tex.stackexchange.com/questions/575230/what-could-be-causing-texlive-packages-to-update-without-explicit-user-intervent/576191?noredirect=1#comment1758755_576191

In addition to disabling automatic installation of missing packages (options(tinytex.install_packages = FALSE)), I would like to request a feature to turn off automatic tlmgr updates being run tlmgr update --self --all whenever LaTeX file is being compiled.

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[yihui]

Now you can set options(tinytex.tlmgr_update = FALSE) to disable tlmgr update.

remotes::install_github('rstudio/tinytex')

Thanks!