ci: add 2 dot files to make sure they are ok

5 jobs for master in 6 minutes and 26 seconds (queued for 1 second)
Name Stage Failure
failed
expe-sasa.4.0.3 Reproduce
make[1]: Leaving directory '/builds/verimag/reproducible-research/sasartifact/expe'
make[1]: warning: jobserver unavailable: using -j1. Add '+' to parent make rule.
make[1]: Entering directory '/builds/verimag/reproducible-research/sasartifact/expe'
make[1]: *** No rule to make target 'ring10000.dot', needed by 'async-unison.bigexpe'. Stop.
make[1]: Leaving directory '/builds/verimag/reproducible-research/sasartifact/expe'
Makefile:7: recipe for target 'bigexpe' failed
make: *** [bigexpe] Error 2
Cleaning up file based variables
ERROR: Job failed: exit code 1