use action to set up R

Author: Heliozoa

.github/workflows/test.yml

@@ -17,7 +17,9 @@ jobs:
       - name: Install depedencies
         run: |
           sudo apt install -y check valgrind  # required for make plugin
-          sudo apt install -y r-base  # required for R plugin
+      - uses: r-lib/actions/setup-r@v1
+        with:
+          r-version: "3.5.3"
       - name: Install tmc-r-tester
         run: |
           Rscript -e 'install.packages(c("devtools","testthat", "httr", "curl"),repos="https://ftp.eenet.ee/pub/cran/")'