add diffusion test

8 jobs for bc-diffusion-dirichlet in 22 minutes and 9 seconds (queued for 3 seconds)
Name Stage Failure
failed
tests-and-coverage Test
Uploading artifacts as "archive" to coordinator... ok  id=581526 responseStatus=201 Created token=Q9t7_rqj
Uploading artifacts...
WARNING: coverage.xml: no matching files
ERROR: No files to upload
Uploading artifacts...
report.xml: found 1 matching files and directories

Uploading artifacts as "junit" to coordinator... ok
id=581526 responseStatus=201 Created token=Q9t7_rqj
Cleaning up file based variables
ERROR: Job failed: exit code 1