Add CI test script and update workflow

scripts/run_ci_tests.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+set -eo pipefail
+timeout 15m pytest -vv ${STRESS_ARGS} \
+    --cov=src --cov-report=xml --cov-report=term-missing \
+    --cov-fail-under=20 src/tests 2>&1 | tee pytest.log
+status=${PIPESTATUS[0]}
+if [[ $status -eq 124 ]]; then
+    echo "::error::Tests exceeded 15-minute limit"
+    tail -n 20 pytest.log
+    exit 1
+fi
+exit $status