Fix IRkernel: set PATH in R before installspec

Use Sys.setenv to add ~/.local/bin to PATH before running installspec,
so R can find the jupyter binary.

Author: rgbkrk

.github/workflows/conformance.yml

@@ -33,10 +33,8 @@ jobs:
           - name: irkernel
             install: |
               python -m pip install jupyter
-              export PATH="$HOME/.local/bin:$PATH"
-              jupyter kernelspec --version
               Rscript -e "install.packages('IRkernel', repos='https://cloud.r-project.org')"
-              Rscript -e "IRkernel::installspec()"
+              Rscript -e "Sys.setenv(PATH = paste0(Sys.getenv('HOME'), '/.local/bin:', Sys.getenv('PATH'))); IRkernel::installspec()"
             kernel-name: ir
 
     steps: