Update r_ci.yml

Author: sarah-colq

.github/workflows/r_ci.yml

@@ -34,6 +34,7 @@ jobs:
         run: |
             sudo apt-get install libcurl4-openssl-dev
             sudo apt-get install libudunits2-dev
+            sudo apt-get install libgdal-dev
       - name: Cache R packages
         uses: actions/cache@v2
         with: