Build(#80): Prerules and workflow update

[andybeet]

Justification

It appears that ubuntu 18.04 is at EOL. This, i think, is the reason the workflow is failing because the model wont compile due to a missing file from a package that was by default part of the OS image. It may have been archived. So an update to a more recent version of abuntu is required -> 20.04. As a safeguard the previously bundled package is not being explicitly installed (r-base-dev). In addition some of the PreRules.am conditional logic is incorrect. This has been fixed

Fixes #80

Types of changes

What types of changes does your code introduce? Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other change (if none of the other choices apply)

Further comments

If this is a New Feature, Breaking change, or a bug fix, the Atlantis Manual will need to be updated to reflect these changes.
Now would be a good time to create an issue in the Atlantis Manual repo and begin documenting your changes.

• I've created an issue
• This is NA

Reviewer instructions:

Assign at least 2 reviewers:

If SETAS_example workflow passes then that is all that needs to be reviewed. EDIT: just realized that the workflow will only run on PRs to dev. However, could you pull the branch and make sure it still compiles and builds for you?

[andybeet]

@erlasturl This is just a fix to allow the built in workflow to run, but it would be good to know if you can build the model from this branch. I have tested it, and can build it both on ubuntu 18.04 and 20.04 (in a docker container)

[erlasturl]

I was able to compile the code on our docker and the Rlink worked

[andybeet]

@erlasturl Great!! this should fix the broken workflow on the other branch. i hope! 🤞