Use pytest markers for CI to select only sbus-based tests to run with Verilator

[flooklab]

Could run Verilator-compatible sbus versions of tests with Verilator using pytest:
SIM=verilator pytest -m verilator tests/test_*.py

[themperek]

Have to add pytest here:

basil/.github/workflows/regression-tests.yml

Line 55 in 6733132

pip install pyvisa pyvisa-sim coveralls cocotb==1.4.0

Maybe better use ventilator as a mark?

[codecov]

Codecov Report

Merging #153 (3db02f0) into master (6733132) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #153   +/-   ##
=======================================
  Coverage   31.96%   31.96%           
=======================================
  Files          72       72           
  Lines        4786     4786           
=======================================
  Hits         1530     1530           
  Misses       3256     3256           

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[themperek]

Thank you.