CI: echo PYTHONHASHSEED for (hopeful) run reproducibility (#44907)

* CI: echo PYTHONHASHSEED for (hopeful) run reproducibility

* Trigger CI

Author: mroeschke

ci/run_tests.sh

@@ -5,6 +5,9 @@
 # https://github.com/pytest-dev/pytest/issues/1075
 export PYTHONHASHSEED=$(python -c 'import random; print(random.randint(1, 4294967295))')
 
+# May help reproduce flaky CI builds if set in subsequent runs
+echo PYTHONHASHSEED=$PYTHONHASHSEED
+
 if [[ "not network" == *"$PATTERN"* ]]; then
     export http_proxy=http://1.2.3.4 https_proxy=http://1.2.3.4;
 fi