The DSL offers a fine-grained interface to the individual stages
of a CI run.
Macros are tic's way of adding several related steps to the relevant
stages.
All macros use the do_ prefix.
The do_package_checks() macro adds default checks for R packages,
including installation of dependencies and running a test coverage
analysis.
The do_pkgdown() macro adds the necessary steps for building
and deploying pkgdown documentation for a package.
The do_bookdown() macro adds the necessary steps for building
and deploying a bookdown book.