Check if Linux distributions is avaliable for OM version

[AnHeuermann]

E.g. for OpenModelica v.1.18.1 jammy is not available, but that is currently the default distribution for GitHub actions on ubuntu-latest. See https://build.openmodelica.org/omc/builds/linux/releases/1.18.1/dists/ for available distributions.

setup-openmodelica should check what distribution is available and report an error if the current OS is not supported.

At the moment $apt-get update will fail:

/bin/bash -c echo deb [arch=amd64 signed-by=/usr/share/keyrings/openmodelica-keyring.gpg]     https://build.openmodelica.org/omc/builds/linux/releases/1.18.0/ `lsb_release -cs` release     | sudo tee /etc/apt/sources.list.d/openmodelica.list
deb [arch=amd64 signed-by=/usr/share/keyrings/openmodelica-keyring.gpg] https://build.openmodelica.org/omc/builds/linux/releases/1.18.0/ jammy release
Running apt-get install
/usr/bin/sudo apt-get update

[...]

Ign:28 https://build.openmodelica.org/omc/builds/linux/releases/1.18.0 jammy InRelease
Err:29 https://build.openmodelica.org/omc/builds/linux/releases/1.18.0 jammy Release
  404  Not Found [IP: 192.36.54.111 443]
Reading package lists...
E: The repository 'https://build.openmodelica.org/omc/builds/linux/releases/1.18.0 jammy Release' does not have a Release file.

[AnHeuermann]

There now is https://openmodelica.org/api/linux.json.
Maybe I could use that to stay up to date or auto-update my JSON.