fix: heroku wkhtmltopdf braks classic hosting

4 jobs for main in 11 minutes and 54 seconds (queued for 28 seconds)
Status Job ID Name Coverage
  Test
failed #541106
lint

00:02:45

passed #541108
system

00:11:53

passed #541107
test

00:08:06

 
  Deploy
skipped #541109
allowed to fail manual
deploy-production
 
Name Stage Failure
failed
lint Test
  ^^^^^^^^^^^^^^^^^^^^^^^^

369 files inspected, 1 offense detected
Uploading artifacts for failed job
Uploading artifacts...
WARNING: coverage/coverage.xml: no matching files
ERROR: No files to upload
Cleaning up file based variables
ERROR: Job failed: command terminated with exit code 1