[R-sig-Debian] Update on docker Python:3 and adding R:4.x

[Dirk Eddelbuettel]

On 24 June 2020 at 19:52, Dave Lange wrote:
| ## Now install R
| ## RUN apt install -t buster-cran40 r-base

It's just a guess but something I noticed working with one of my Dockerfiles
is that the above does not work too well -- I think due to the independence
of the 'layers' from each RUN command which I mentioned earlier. So when you
I run apt install, I now always update first so maybe try

   RUN apt update && apt install -y r-base

instead.  (I also removed the -t buster-cran40 as the 'highest version should
win'. That may or may not work. Adjust as needed.)

Dirk

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