- Add libtiff-dev

- Add libpoppler-cpp-dev

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

bug-fix: libpcre2-8-0 is needed along with libpcre2 for r-devel

Without this library, the following error is produced

```
$$ docker run -it rocker/r-ver:devel bash
root@012af310be7d:/# R
/usr/local/lib/R/bin/exec/R: error while loading shared libraries: libpcre2-8.so.0: cannot open shared object file: No such file or directory
```

The same error doesn't show up in the rocker/rstudio and other
containers which inherit from this image is because another linux package is
installing the dependency libpcre2-8-0 on the succeeding images.

But for the rocker/r-ver:devel image to work, this dependency is needed.

- Install system dependencies for R package rgl

- Add triggers

- Add Dockerfiles
- Add .gitlab-ci.yml

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

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

- Add curl and nano