Skip Test coverage step on GitHub Action CI (#3895)

Author: yutannihilation

.github/workflows/R-CMD-check.yaml

@@ -97,7 +97,8 @@ jobs:
           name: ${{ runner.os }}-r${{ matrix.config.r }}-results
           path: check
 
-      - name: Test coverage
-        if: matrix.config.os == 'macOS-latest' && matrix.config.r == '3.6'
-        run: covr::codecov()
-        shell: Rscript {0}
+      # TODO: uncomment this when we fix the failure of covr::codecov()
+      # - name: Test coverage
+      #   if: matrix.config.os == 'macOS-latest' && matrix.config.r == '3.6'
+      #   run: covr::codecov()
+      #   shell: Rscript {0}