ci: add copilot setup workflow and componentize install steps

[Copilot]

Introduces a shared composite action for R environment setup and adds a copilot-setup-steps workflow required for GitHub Copilot agent support. All existing workflows now delegate the pandoc/R/dependency installation sequence to the shared action.

New files

• .github/workflows/install/action.yml — composite action wrapping setup-pandoc, setup-r, and setup-r-dependencies with inputs for r-version, http-user-agent, needs, extra-packages, and cache-version
• .github/workflows/copilot-setup-steps.yml — Copilot agent setup workflow (job name is required to be copilot-setup-steps); installs full dev environment + air

Updated workflows

All four existing workflows replace their inline setup steps with a single uses: ./.github/workflows/install call:

- uses: ./.github/workflows/install
  with:
    token: ${{ secrets.GITHUB_TOKEN }}
    needs: check
    extra-packages: any::rcmdcheck

• R-CMD-check.yaml — passes r-version and http-user-agent from the matrix
• pkgdown.yaml — needs: website, extra-packages: any::pkgdown local::.
• test-coverage.yaml — needs: coverage, extra-packages: any::covr
• pr-commands.yaml — /document job uses the install action; /style job drops styler in favour of posit-dev/setup-air + air format .

Original prompt

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This section details on the original issue you should resolve

<issue_title>ci: include copilot setup workflow</issue_title>
<issue_description>Adapt https://raw.githubusercontent.com/Gilead-BioStats/qcthat/refs/heads/dev/.github/workflows/copilot-setup-steps.yml to a datawrap-specific workflow. We'll also need to implement the equivalent of https://raw.githubusercontent.com/Gilead-BioStats/qcthat/refs/heads/dev/.github/workflows/install/action.yml

That setup was inspired by https://github.com/r-lib/pillar/tree/main/.github/workflows , which I thought was a new standard for the r-lib org (and a model for how to build better workflows), but I'm not seeing widespread adoption of that setup even within r-lib. Evaluate whether the component-based workflows make sense. I like the idea, and would prefer to break things down this way if it's a good idea.

If it does make sense, update the other workflows in this repository to share component steps. For example, .github/workflows/R-CMD-check.yaml should also use .github/workflows/install/, similar to how https://raw.githubusercontent.com/r-lib/pillar/refs/heads/main/.github/workflows/R-CMD-check.yaml does. Also see https://raw.githubusercontent.com/r-lib/pillar/refs/heads/main/.github/workflows/pkgdown.yaml and https://raw.githubusercontent.com/r-lib/pillar/refs/heads/main/.github/workflows/pr-commands.yaml for component-ized examples of standard workflows.</issue_description>

<agent_instructions>Break off reused portions of workflows as shown with workflows/install. Use r-lib/pillar as the main model for the "right" way to break down workflows.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes ci: include copilot setup workflow #16

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[Copilot]

Pull request overview

This PR introduces a reusable composite action to standardize R/pandoc/dependency setup across CI workflows, and adds the required copilot-setup-steps workflow for GitHub Copilot agent support.

Changes:

• Added a shared composite action (.github/workflows/install) wrapping setup-pandoc, setup-r, and setup-r-dependencies.
• Added a copilot-setup-steps workflow that provisions a full dev environment (plus air).
• Refactored existing workflows to use the shared install action; updated coverage reporting to generate Cobertura output and upload via Codecov action.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
.github/workflows/install/action.yml	New composite action to centralize R/pandoc/dependency installation.
.github/workflows/copilot-setup-steps.yml	New workflow to prepare the repo environment for Copilot agent runs.
.github/workflows/R-CMD-check.yaml	Uses the composite install action instead of inline setup steps.
.github/workflows/pkgdown.yaml	Uses the composite install action for site builds.
.github/workflows/pr-commands.yaml	/document uses composite install; /style switches from styler to air.
.github/workflows/test-coverage.yaml	Uses composite install and switches to Cobertura + Codecov action upload.

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