[CI] Properly cache Docker containers for R tests #4458
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The logic for naming containers has become quite cryptic. I'll need to clean up |
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There are two R test suites currently running, one for R 3.4.4 and another for R 3.5.3. They require two separate Docker containers, but currently only one of them is being cached; the other container is being built from scratch.
After this small fix, both R containers will be cached.