Fix CI (missing reveal.js as artifact)

2 jobs for master in 52 seconds (queued for 4 seconds)
Status Name Job ID Coverage
failed build #85973


skipped pages #85974
Name Stage Failure
build Build
Created cache
Uploading artifacts for successful job
Uploading artifacts...
lib: found 6 matching files and directories

css/theme/stereopticon.css: found 1 matching files and directories

reveal.js: found 12335 matching files and directories

ERROR: Uploading artifacts as "archive" to coordinator... too large archive id=85973 responseStatus=413 Request Entity Too Large status=413 token=1xEpDssB
FATAL: too large
Cleaning up file based variables
ERROR: Job failed: exit code 1