ci: add run_examples job with run_dontrun=TRUE

Refs #163

.gitlab-ci.yml

@@ -25,6 +25,11 @@ test_all:
   script:
   - R -q -e 'options(error = function() quit(save = "no", status = 1)); testthat::test_local(stop_on_failure = TRUE, stop_on_warning = TRUE)'
 
+run_examples:
+  stage: checks
+  script:
+  - R -q -e 'options(error = function() quit(save = "no", status = 1)); devtools::run_examples(run_donttest = TRUE, run_dontrun = TRUE)'
+
 check:
   stage: checks
   except:
@@ -42,10 +47,6 @@ check:
     refs:
       - schedules
   before_script:
-    ##
-    ## Optionally, if you will be using any Git commands, set the user name and
-    ## and email.
-    ##
     - git config --global user.email "[email protected]"
     - git config --global user.name "Gitlab CI"
     - git remote add github ${GITHUB_CLONE} || git remote set-url github ${GITHUB_CLONE}