Update r.yml

Updated from https://github.com/r-lib/actions/tree/master/examples#readme

.github/workflows/r.yml

@@ -1,37 +1,83 @@
-# This workflow uses actions that are not certified by GitHub.
-# They are provided by a third-party and are governed by
-# separate terms of service, privacy policy, and support
-# documentation.
-#
-# See https://github.com/r-lib/actions/tree/master/examples#readme for
-# additional example workflows available for the R community.
-
-name: R
-
+# For help debugging build failures open an issue on the RStudio community with the 'github-actions' tag.
+# https://community.rstudio.com/new-topic?category=Package%20development&tags=github-actions
 on:
   push:
-    branches: [ master ]
+    branches:
+      - main
+      - master
   pull_request:
-    branches: [ master ]
+    branches:
+      - main
+      - master
+
+name: R-CMD-check
 
 jobs:
-  build:
-    runs-on: macOS-latest
+  R-CMD-check:
+    runs-on: ${{ matrix.config.os }}
+
+    name: ${{ matrix.config.os }} (${{ matrix.config.r }})
+
     strategy:
+      fail-fast: false
       matrix:
-        r-version: [3.5, 3.6]
+        config:
+          - {os: windows-latest, r: 'release'}
+          - {os: macOS-latest, r: 'release'}
+          - {os: ubuntu-20.04, r: 'release', rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"}
+          - {os: ubuntu-20.04, r: 'devel', rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"}
+
+    env:
+      R_REMOTES_NO_ERRORS_FROM_WARNINGS: true
+      RSPM: ${{ matrix.config.rspm }}
 
     steps:
       - uses: actions/checkout@v2
-      - name: Set up R ${{ matrix.r-version }}
-        uses: r-lib/actions/setup-r@ffe45a39586f073cc2e9af79c4ba563b657dc6e3
+
+      - uses: r-lib/actions/setup-r@v1
         with:
-          r-version: ${{ matrix.r-version }}
+          r-version: ${{ matrix.config.r }}
+
+      - uses: r-lib/actions/setup-pandoc@v1
+
+      - name: Query dependencies
+        run: |
+          install.packages('remotes')
+          saveRDS(remotes::dev_package_deps(dependencies = TRUE), ".github/depends.Rds", version = 2)
+          writeLines(sprintf("R-%i.%i", getRversion()$major, getRversion()$minor), ".github/R-version")
+        shell: Rscript {0}
+
+      - name: Cache R packages
+        if: runner.os != 'Windows'
+        uses: actions/cache@v2
+        with:
+          path: ${{ env.R_LIBS_USER }}
+          key: ${{ runner.os }}-${{ hashFiles('.github/R-version') }}-1-${{ hashFiles('.github/depends.Rds') }}
+          restore-keys: ${{ runner.os }}-${{ hashFiles('.github/R-version') }}-1-
+
+      - name: Install system dependencies
+        if: runner.os == 'Linux'
+        run: |
+          while read -r cmd
+          do
+            eval sudo $cmd
+          done < <(Rscript -e 'writeLines(remotes::system_requirements("ubuntu", "20.04"))')
+
       - name: Install dependencies
         run: |
-          install.packages(c("remotes", "rcmdcheck"))
           remotes::install_deps(dependencies = TRUE)
+          remotes::install_cran("rcmdcheck")
         shell: Rscript {0}
+
       - name: Check
-        run: rcmdcheck::rcmdcheck(args = "--no-manual", error_on = "error")
+        env:
+          _R_CHECK_CRAN_INCOMING_REMOTE_: false
+        run: rcmdcheck::rcmdcheck(args = c("--no-manual", "--as-cran"), error_on = "warning", check_dir = "check")
         shell: Rscript {0}
+
+      - name: Upload check results
+        if: failure()
+        uses: actions/upload-artifact@main
+        with:
+          name: ${{ runner.os }}-r${{ matrix.config.r }}-results
+          path: check