Opt-in for deferred failure

[krlmlr]

get_stage("script") %>%
  set_keep_going() %>% # do not stop if a certain step errors down the line

  # Run R CMD check
  step_rcmdcheck() %>%

  # lint the R source code
  step_lint() %>%

  # lint the documentation web page
  step_weblint()

[pat-s]

Would it be more consistent to support this via an arg keep_going across all funs? (yeah, lots of work)

set_keep_going() is somewhat standalone compared to the add_, do_ or get_ patterns.