- r-ver, verse: Use Renviron.site instead of Renviron
- rstudio: Update Git to version 2.35.1
- tidyverse: Add cmake

- tidyverse:
    - Add libxst6
    - Add dplyr database backends
- verse:
    - Update CTAN_REPO url to https
    - Add hugo, libglpk-dev, libgmp3-dev
    - Add R package distill
- geospatial:
    - Add gdal-bin
    - Add R packages spatialreg, stars, terra, tidync, tmap
- general: Update .gitlab-ci.yml

- Reduce image size

- Remove LC_ALL from ENV
- Update localisation generation

- r-ver: Copy R from rsi image
- rstudio: Copy Git from gsi image
  - Update rstudio install scripts
- verse: Remove packages less and ssh
  - Packages are now part of rstudio image

- r-ver: Move from package libpcre3 to libpcre2
- verse: Add package libpcre2-dev

- Update LABEL
- Setup for repository mirror
- Fix CRAN build-time variable

- Update Dockerfile for latest version
- Add .gitlab-ci.yml

* makes all of its content inherit the same group (staff) upon creation
* needed with debian:buster, which does not set this for the whole /usr/local anymore

Fixes #175

All the rocker r-base/r-apt based images already have the R recommended
packages pre-installed, see e.g. [0].

By installing the recommended packages also on the r-ver based images the
compatibility with packrat is improved, when it is used in a mixed mode
on top of different distribution with recommended packages pre-installed
and r-ver based images. Packrat does not include recommended packages in
its package library packrat.lock, if those are in the system library,
see also the pakrat docu page 5 in [1]. This leads to unresolved
dependencies and would require manually adding those also to the packrat
library.

The R installer already includes a mechanism to also install the
recommended packages, which is just activated by this change. The R
recommended packages are also versioned by the R version, see [2]-[6].

[0] r-recommended: https://github.com/rocker-org/rocker/blob/master/r-base/Dockerfile#L50
[1] https://cran.r-project.org/web/packages/packrat/packrat.pdf
[2] https://cran.r-project.org/src/contrib/${R-Version}/Recommended/
[3] https://cran.r-project.org/src/contrib/3.5.1/Recommended/
[4] R_PKGS_RECOMMENDED: https://github.com/wch/r-source/blob/trunk/share/make/vars.mk
[5] https://github.com/wch/r-source/blob/trunk/src/library/Recommended/Makefile.in
[6] https://github.com/wch/r-source/blob/trunk/tools/rsync-recommended

remove explicit openblas in R installation, replaced it by the shared Blas system, as used by the debian R package. it is now possible to switch Blas implementation using LD_LIBRARY_PATH or update-alternatives by example. Also added the --with-tcltk flag, that was already automatically setup to make it more explicit.