Update test_r.yaml

try using shell to run as R

.github/workflows/test_r.yaml

@@ -58,10 +58,11 @@ jobs:
           python -m pip install --no-deps .
           pip install -r requirements.txt
       
-      - name: point R to pip env
+      - name: Run pip env using R reticulate
         run: |
           install.packages("reticulate")
           import("harmonize_wq")
+          shell: Rscript {0}
         
       - name: Run pytest
         run: pytest -v harmonize_wq