[CI] Minor changes to make buildx cache work in tests for install R from source #410
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I made a mistake in the syntax, so I'll fix it.
The correct syntax is one of the following:
https://github.com/docker/buildx/blob/b8bcf1d810c754a696496d6ad05e34b699ad8af0/docs/reference/buildx_build.md#cache-from