Add Trilinos build script

[jmgate]

It'd be worthwhile to include a build script for a non-trivial code in the documentation as another real-world example. Trilinos would be worthwhile, because building Trilinos was what originally motivated the automation framework that eventually begat staged-script. The Trilinos CI testing is primarily driven by PullRequestLinuxDriverTest.py, so we'd have to see if it's possible to mimic what's being done there, without access to Trilinos' machines, environments, etc.

[jmgate]

I'm afraid PullRequestLinuxDriverTest.py is more of a complicated mess than when I last saw it ~4 years ago, so it would take quite some time to translate into a "one build script to rule them all". I asked if there was a straightforward way to reproduce CI testing failures locally, and was pointed to these instructions, though I'm not sure that helps much.