Use github actions for CI tests

.github/workflows/R-check-depends-only.yaml

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+
+# Runs without suggested packages as these must be handled conditionally
+# Workflow derived from https://github.com/r-lib/actions/tree/v2/examples
+# Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
+
+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: 'release'}
+
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+      R_KEEP_PKG_SOURCE: yes
+      _R_CHECK_CRAN_INCOMING_: false
+      _R_CHECK_FORCE_SUGGESTS_: false
+      _R_CHECK_DEPENDS_ONLY_: true
+
+    steps:
+      - uses: actions/checkout@v2
+
+      # Always try to use the latest pandoc version
+      # https://github.com/jgm/pandoc/releases
+      - uses: r-lib/actions/setup-pandoc@v2
+        with:
+          pandoc-version: '2.19.2'
+
+      - 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
+
+      # TODO: Check which of the ignore conditions are still relevant given the
+      # current suggested dependencies and the minimum supported R version.
+      # Update if anything out of date or not needed anymore.
+      #
+      # `{EGAnet}` needs `{XML}`, and there are currently issues in downloading
+      # it for certain R versions. So just don't install it for now.
+      - uses: r-lib/actions/setup-r-dependencies@v2
+        with:
+          pak-version: devel
+          extra-packages: |
+            any::rcmdcheck
+          needs: check
+
+      # Don't error on "note" because if any of the suggested packages are not available
+      # for a given R version, this generates a NOTE causing unnecessary build failure
+      - uses: r-lib/actions/check-r-package@v2
+        with:
+          error-on: '"warning"'
+          upload-snapshots: true

.github/workflows/R-check.yaml

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+# Workflow derived from https://github.com/r-lib/actions/tree/v2/examples
+# Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
+
+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: 'devel'}
+          - {os: macOS-latest,   r: 'release'}
+          - {os: macOS-latest,   r: 'oldrel'}
+
+          - {os: windows-latest, r: 'devel'}
+          - {os: windows-latest, r: 'release'}
+          - {os: windows-latest, r: 'oldrel'}
+
+          - {os: ubuntu-latest,  r: 'devel', http-user-agent: 'release'}
+          - {os: ubuntu-latest,  r: 'release'}
+          - {os: ubuntu-latest,  r: 'oldrel'}
+
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+      R_KEEP_PKG_SOURCE: yes
+      _R_CHECK_CRAN_INCOMING_: false
+      _R_CHECK_FORCE_SUGGESTS_: false
+
+    steps:
+      - uses: actions/checkout@v2
+
+      # Always try to use the latest pandoc version
+      # https://github.com/jgm/pandoc/releases
+      - uses: r-lib/actions/setup-pandoc@v2
+        with:
+          pandoc-version: '2.19.2'
+
+      - 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
+
+      # TODO: Check which of the ignore conditions are still relevant given the
+      # current suggested dependencies and the minimum supported R version.
+      # Update if anything out of date or not needed anymore.
+      #
+      # `{EGAnet}` needs `{XML}`, and there are currently issues in downloading
+      # it for certain R versions. So just don't install it for now.
+      - uses: r-lib/actions/setup-r-dependencies@v2
+        with:
+          pak-version: devel
+          extra-packages: |
+            any::rcmdcheck
+          needs: check
+
+      # Don't error on "note" because if any of the suggested packages are not available
+      # for a given R version, this generates a NOTE causing unnecessary build failure
+      - uses: r-lib/actions/check-r-package@v2
+        with:
+          error-on: '"warning"'
+          upload-snapshots: true

.github/workflows/codecov.yaml

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+# Workflow derived from https://github.com/r-lib/actions/tree/master/examples
+# Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+
+name: test-coverage
+
+jobs:
+  test-coverage:
+    runs-on: ubuntu-latest
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: r-lib/actions/setup-r@v1
+        with:
+          use-public-rspm: true
+
+      - uses: r-lib/actions/setup-r-dependencies@v1
+        with:
+          extra-packages: covr
+
+      - name: Test coverage
+        run: covr::codecov()
+        shell: Rscript {0}

.github/workflows/lint.yaml

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+# Workflow derived from https://github.com/r-lib/actions/tree/master/examples
+# Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+
+name: lint
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: r-lib/actions/setup-r@v1
+        with:
+          use-public-rspm: true
+
+      - uses: r-lib/actions/setup-r-dependencies@v1
+        with:
+          extra-packages: lintr
+
+      - name: Lint
+        run: lintr::lint_package()
+        shell: Rscript {0}