added rpackage workflow

.github/workflows/rpackage.yml

@@ -0,0 +1,63 @@
+on:
+  push:
+    branches: [main, master]
+    paths:
+      - "antidotum"
+      - ".github"
+  pull_request:
+    branches: ["main"]
+    paths:
+      - "antidotum"
+      - ".github"
+
+name: R-CMD-check
+
+permissions: read-all
+
+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" }
+          # use 4.0 or 4.1 to check with rtools40's older compiler
+          - { os: windows-latest, r: "oldrel-4" }
+
+          - { os: ubuntu-latest, r: "devel", http-user-agent: "release" }
+          - { os: ubuntu-latest, r: "release" }
+          - { os: ubuntu-latest, r: "oldrel-1" }
+          - { os: ubuntu-latest, r: "oldrel-2" }
+          - { os: ubuntu-latest, r: "oldrel-3" }
+          - { os: ubuntu-latest, r: "oldrel-4" }
+
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+      R_KEEP_PKG_SOURCE: yes
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - 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
+          build_args: 'c("--no-manual","--compact-vignettes=gs+qpdf")'