R Example Does Not Work as Docker Image

[BenGatewood]

I am trying to use the R example code provided in this repo which works fine until I try and run it inside a Docker container. I have tried multiple variations on the base Dockerfile listed here as well as the R-specific one in this article: https://docs.microsoft.com/en-us/azure/azure-functions/functions-create-function-linux-custom-image

My Dockerfile presently looks like:

# To enable ssh & remote debugging on app service change the base image to the one below
# FROM mcr.microsoft.com/azure-functions/node:2.0-appservice
FROM mcr.microsoft.com/azure-functions/node:3.0

ENV AzureWebJobsScriptRoot=/home/site/wwwroot \
    AzureFunctionsJobHost__Logging__Console__IsEnabled=true

RUN apt update
RUN apt install -y r-base
RUN R -e "install.packages('httpuv', repos='http://cran.rstudio.com/')"

COPY . /home/site/wwwroot

RUN cd /home/site/wwwroot

I've attached the full logs from attempting to run this but the only failure is:

fail: Worker.HttpWorkerProcess.bbbfc2f8-34a3-4a6b-89d9-8a537071af94[0]
      Failed to start Worker Channel. Process fileName: Rscript
System.ComponentModel.Win32Exception (2): No such file or directory
   at System.Diagnostics.Process.ForkAndExecProcess(String filename, String[] argv, String[] envp, String cwd, Boolean redirectStdin, Boolean redirectStdout, Boolean redirectStderr, Boolean setCredentials, UInt32 userId, UInt32 groupId, UInt32[] groups, Int32& stdinFd, Int32& stdoutFd, Int32& stderrFd, Boolean usesTerminal, Boolean throwOnNoExec)
   at System.Diagnostics.Process.StartCore(ProcessStartInfo startInfo)
   at System.Diagnostics.Process.Start()
   at Microsoft.Azure.WebJobs.Script.Workers.WorkerProcess.StartProcessAsync() in /src/azure-functions-host/src/WebJobs.Script/Workers/ProcessManagement/WorkerProcess.cs:line 65

As a test, I ran a shell in the base image: mcr.microsoft.com/azure-functions/node:3.0 and manually executed all the build steps in the Dockerfile. They all completed successfully and I could happily execute Rscript both with and without the full path to the executable

Any help greatly appreciated

logs.txt