Test benchmarking (one case, short)

@henryleberre this failed - I ran the command before failure on the runner and it worked fine:

login-phoenix-slurm-2: MFC/MFC $ ./mfc.sh bench_diff master/bench-cpu.yaml pr/bench-cpu.yaml
mfc: Found CMake: /storage/coda1/p-sbryngelson3/0/sbryngelson3/runners/actions-runner-3/_work/MFC/MFC/build/cmake/bin/cmake.
mfc: OK > (venv) Entered the Python 3.9.12 virtual environment (>= 3.8).

      .=++*:          -+*+=.        | sbryngelson3@login-phoenix-slurm-2.pace.gatech.edu [Linux]
     :+   -*-        ==   =* .      | ----------------------------------------------------------
   :*+      ==      ++    .+-       | --jobs 1
  :*##-.....:*+   .#%+++=--+=:::.   | --mpi
  -=-++-======#=--**+++==+*++=::-:. | --no-gpu
 .:++=----------====+*= ==..:%..... | --no-debug
  .:-=++++===--==+=-+=   +.  :=     | --targets pre_process, simulation, and post_process
  +#=::::::::=%=. -+:    =+   *:    | ----------------------------------------------------------
 .*=-=*=..    :=+*+:      -...--    | $ ./mfc.sh (build, run, test, clean, count, packer) --help

 Comparing Bencharks: master/bench-cpu.yaml is x times slower than pr/bench-cpu.yaml.

  Case              Pre Process   Simulation   Post Process
 ───────────────────────────────────────────────────────────
  3D_shockdroplet         0.50x        0.99x          0.67x

mfc: (venv) Exiting the Python virtual environment.

but something else in the action appears broken.

MFlowCode / MFC

Test benchmarking (one case, short) #323