ci: speed up CI using multiple processes with pylint (#67056)

pylint.sh

@@ -2,4 +2,4 @@
 set -e -x
 env
 
-pylint -f parseable --rcfile pylint.rc "$@" | tee pylint.out; test $PIPESTATUS -eq 0
+pylint --jobs ${NUMPROCESSES:-1} -f parseable --rcfile pylint.rc "$@" | tee pylint.out; test $PIPESTATUS -eq 0

tox.ini

@@ -12,6 +12,7 @@ setenv =
   BRANCH_NAME={env:BRANCH_NAME:}
   SETUPTOOLS_USE_DISTUTILS=stdlib
   coverage: COVERAGE=--junitxml=junit-{envname}.xml --cov-report xml --cov-report html --cov=chrono/ --cov-config .coveragerc
+
 deps =
   pytest-cov
   pytest-django
@@ -38,6 +39,9 @@ commands =
   codestyle: pre-commit run --all-files --show-diff-on-failure
 
 [testenv:pylint]
+setenv =
+  NUMPROCESSES={env:NUMPROCESSES:6}
+
 deps =
   pytest-django
   pytest!=5.3.3