ci(revdepcheck): add artifacts for browsing report documents after the job

Refs #86

.gitlab-ci.yml

@@ -149,3 +149,9 @@ revdepcheck_patched:
     - R -e 'remotes::install_github("https://github.com/r-lib/revdepcheck")'
     - R -e 'revdepcheck::revdep_check(num_workers = 2)'
     - R -e 'if (any(sapply(revdepcheck::revdep_summary(), function(x) {any(x$cmp$change == 1)}))) stop()'
+  artifacts:
+    paths:
+      - revdep/README.md
+      - revdep/problems.md
+      - revdep/failures.md
+      - revdep/cran.md