HTTPS-el gondja lesz a pdf generáló kódnak

Forrás: https://github.com/rvm/rvm/issues/4764#issuecomment-527723675

After some googling, I've found this solution on how to install old library onto debian.

[Debian: Is it possible/safe to install packages from an older version of the repository?](https://unix.stackexchange.com/questions/60555/debian-is-it-possible-safe-to-install-packages-from-an-older-version-of-the-rep)

What I did

1. Create a new source file for stretch in `/etc/apt/source.list.d/` and add source for stretch

```
deb http://deb.debian.org/debian/ stretch main contrib non-free
deb-src http://deb.debian.org/debian stretch main contrib non-free
```

1. Create a apt config file under `/etc/apt/apt.conf.d` and add this line to the file

```
APT::Default-Release "buster";
```

1. run apt update
2. install libssl1.0-dev library using apt (apt will be using stretch source)
3. successfully install ruby 2.3.8 using rvm

I don't know if this will be much of help