Update pkgdown GitHub Action (#4151)

* Update pkgdown GitHub Action

* Include release event

* Fix a typo

* Install tidytemplate

Author: yutannihilation

.github/workflows/pkgdown.yaml

@@ -10,19 +10,41 @@ name: pkgdown
 jobs:
   pkgdown:
     runs-on: macOS-latest
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
     steps:
       - uses: actions/checkout@v2
+
       - uses: r-lib/actions/setup-r@master
+
       - uses: r-lib/actions/setup-pandoc@master
+
+      - name: Query dependencies
+        run: |
+          install.packages('remotes')
+          saveRDS(remotes::dev_package_deps(dependencies = TRUE), ".github/depends.Rds", version = 2)
+          writeLines(sprintf("R-%i.%i", getRversion()$major, getRversion()$minor), ".github/R-version")
+        shell: Rscript {0}
+
+      - name: Cache R packages
+        uses: actions/cache@v1
+        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 dependencies
         run: |
-          install.packages("remotes")
           remotes::install_deps(dependencies = TRUE, type = "binary")
           remotes::install_github("tidyverse/tidytemplate")
           remotes::install_dev("pkgdown")
         shell: Rscript {0}
+
       - name: Install package
         run: R CMD INSTALL .
+
       - name: Deploy package
-        run: pkgdown::deploy_to_branch(new_process = FALSE)
-        shell: Rscript {0}
+        run: |
+          git config --local user.email "actions@github.com"
+          git config --local user.name "GitHub Actions"
+          Rscript -e 'pkgdown::deploy_to_branch(new_process = FALSE)'