add pkgdown workflow

.github/workflows/pkgdown.yml

@@ -0,0 +1,55 @@
+name: gh-pages
+
+on:
+  push:
+  branches:
+  - main
+  - master
+
+
+jobs:
+  pkgdown:
+  runs-on: macOS-latest
+env:
+  GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+steps:
+  - uses: actions/checkout@v3
+
+- uses: r-lib/actions/setup-r@v2
+
+- uses: r-lib/actions/setup-pandoc@v2
+
+- name: Query dependencies
+run: |
+  install.packages('remotes')
+saveRDS(remotes::dev_package_deps(dependencies = TRUE), ".github/depends.Rds", version = 2)
+writeLines(sprintf("R-%i.%i", getRversion()$major, getRversion()$minor), ".github/R-version")
+shell: Rscript {0}
+
+- name: Cache R packages
+uses: actions/cache@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 binary dependencies
+if: runner.os != 'Linux'
+run: |
+  remotes::install_deps(dependencies = TRUE, type="binary")
+shell: Rscript {0}
+
+- name: Install pkgdown
+run: |
+  install.packages("pkgdown", type = "binary")
+shell: Rscript {0}
+
+- name: Install package
+run: R CMD INSTALL .
+
+- name: Deploy package
+run: |
+  git config --local user.email "[email protected]"
+git config --local user.name "GitHub Actions"
+Rscript -e 'pkgdown::deploy_to_branch(new_process = FALSE)'