Tinytex install fails in docker build

[svenvanderburg]

When trying to build with docker I run into the following error:

#11 101.2 > tinytex::install_tinytex(force = TRUE)
#11 101.2 trying URL 'https://github.com/yihui/tinytex/raw/master/tools/install-unx.sh'
#11 101.6 Error in download.file("https://github.com/yihui/tinytex/raw/master/tools/install-unx.sh",  :
#11 101.6   cannot open URL 'https://github.com/yihui/tinytex/raw/master/tools/install-unx.sh'
#11 101.6 Calls: <Anonymous> -> download.file
#11 101.6 In addition: Warning message:
#11 101.6 In download.file("https://github.com/yihui/tinytex/raw/master/tools/install-unx.sh",  :
#11 101.6   cannot open URL 'https://github.com/yihui/tinytex/raw/master/tools/install-unx.sh': HTTP status was '404 Not Found'

This seems to be related to: rstudio/tinytex#336, tinytex had the master branch changed to main branch.