Windows Server 2019: "R command not found"

[DomBennett]

Hi!

I'm working on an R package (outsider.base) that makes use of Docker with linux containers.

So far, I've found that it is possible to have Docker running from initiation when using the "Windows Server 2019" image (a so-called "heterogeneous build"). (Note: The image requires a request for access.)

Using this image though seems to lead to an "R command not found" error:
Failing example

There is no problem if I drop the "Windows Server 2019" image:
Passing example

But then large elements of my code that depend on Docker are not being tested.

Any ideas on how I might solve this issue?

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I found a simple issue (26) to do with R not being mounted on E:. Presumably though this issue was corrected and shouldn't be the same cause in this instance. (Although, in my builds I get the message "R is now available on drive C:".)

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Useful links
Current Appveyor script
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