Add weekly GPUMD rebuild and test

Eric Lindgrenrequested to merge
nightly-rebuild-of-gpumd into master

Rebuild GPUMD from master on schedule, and then builds and tests calorine. Hopefully helps us catch when something upstream changes.

Could we potentially also update NEP_CPU in this? Not easy, since NEP_CPU is copied over into calorine, and is not an external dependency.

Edited by Eric Lindgren

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