Switch GitHub Actions to modern r-lib actions

[Copilot]

Reviewer feedback requested switching from manual system dependency management to modern r-lib actions approach.

Changes

• Replaced manual workflow steps with r-lib actions

  • r-lib/actions/setup-r-dependencies@v2 handles system deps automatically
  • r-lib/actions/check-r-package@v2 replaces manual rcmdcheck calls
  • use-public-rspm: true for faster binary package installation

• Removed overkill system dependencies step (libssl-dev, libcurl4-openssl-dev, etc.) - now handled by r-lib

• Added ^scripts$ to .Rbuildignore

Workflow comparison

Before:

- name: Install system dependencies
  run: |
    sudo apt-get install -y libssl-dev libcurl4-openssl-dev ...
    while read -r cmd; do eval sudo $cmd; done < <(Rscript -e '...')
- name: Install dependencies
  run: remotes::install_deps(...)
- name: Check
  run: rcmdcheck::rcmdcheck(...)

After:

- uses: r-lib/actions/setup-r-dependencies@v2
  with:
    extra-packages: any::rcmdcheck
    needs: check

- uses: r-lib/actions/check-r-package@v2
  with:
    args: 'c("--no-manual", "--as-cran")'

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