set RStudio package manager globally

Author: lorenzwalthert

.github/workflows/benchmarking.yaml

@@ -1,13 +1,13 @@
+name: Continuous Benchmarks
 on:
   push:
     branches:
     - master
   pull_request:
     branches:
     - master
-
-name: Continuous Benchmarks
-
+env:
+  RSPM: "https://packagemanager.rstudio.com/cran/__linux__/bionic/291"
 jobs:
   build:
     runs-on: ubuntu-18.04
@@ -28,9 +28,6 @@ jobs:
         with:
           r-version: '4.0.0'
           http-user-agent: "R/4.0.0 (ubuntu-18.04) R (4.0.0 x86_64-pc-linux-gnu x86_64 linux-gnu) on GitHub Actions"
-        env:
-          RSPM: "https://packagemanager.rstudio.com/cran/__linux__/bionic/291"
-
       - name: Query dependencies
         run: |
           install.packages('remotes')