Add GitHub workflows

.github/.gitignore

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+*.html

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

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+# Workflow derived from
+# https://github.com/r-lib/actions/blob/v2-branch/examples/check-standard.yaml
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+
+name: R-CMD-check
+
+jobs:
+  R-CMD-check:
+    runs-on: ${{ matrix.config.os }}
+
+    name: ${{ matrix.config.os }} (${{ matrix.config.r }})
+
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+          - {os: macos-latest,   r: 'release'}
+          - {os: windows-latest, r: 'release'}
+          - {os: ubuntu-latest,   r: 'devel', http-user-agent: 'release'}
+          - {os: ubuntu-latest,   r: 'release'}
+          - {os: ubuntu-latest,   r: 'oldrel-1'}
+
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+      R_KEEP_PKG_SOURCE: yes
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: r-lib/actions/setup-pandoc@v2
+
+      - uses: r-lib/actions/setup-r@v2
+        with:
+          r-version: ${{ matrix.config.r }}
+          http-user-agent: ${{ matrix.config.http-user-agent }}
+          use-public-rspm: true
+
+      - uses: r-lib/actions/setup-r-dependencies@v2
+        with:
+          extra-packages: any::rcmdcheck
+          needs: check
+
+      - uses: r-lib/actions/check-r-package@v2
+        with:
+          upload-snapshots: true

.github/workflows/check-pkgdown.yml

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+on:
+    push:
+      branches:
+        - master
+    pull_request:
+      branches:
+        - master
+
+name: check-pkgdown
+
+jobs:
+    check_pkgdown:
+      runs-on: ubuntu-22.04
+
+      env:
+        GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+
+      steps:
+        - uses: actions/checkout@v3
+        - uses: r-lib/actions/setup-r@v2
+          with:
+            r-version: 'release'
+        - uses: r-lib/actions/setup-r-dependencies@v2
+          with:
+            extra-packages: any::devtools, any::pkgdown
+
+        - name: Install dependencies
+          run: devtools::install_github("https://github.com/ropensci-org/rotemplate")
+          shell: Rscript {0}
+
+        - name: Check pkgdown
+          run: pkgdown::check_pkgdown()
+          shell: Rscript {0}

.github/workflows/test-coverage.yaml

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+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+name: test-coverage
+
+jobs:
+  test-coverage:
+    runs-on: macOS-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: r-lib/actions/setup-r@v2
+        with:
+          r-version: 'release'
+
+      - name: Install dependencies
+        run: |
+          install.packages(c("remotes", "rcmdcheck"))
+          remotes::install_deps(dependencies = TRUE)
+          remotes::install_cran("covr")
+        shell: Rscript {0}
+
+      - name: Test coverage
+        run: covr::codecov()
+        shell: Rscript {0}