build: add new Nightly Stress Extra pipeline script

We would like to be able to run a hand-curated list of tests for many
more iterations than the current nightly suite.

Epic: none
Release note: None

Author: stevendanna

build/teamcity/cockroach/nightlies/cockroach_nightly_extra_stress.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+# Copyright 2025 The Cockroach Authors.
+#
+# Use of this software is governed by the CockroachDB Software License
+# included in the /LICENSE file.
+
+set -euxo pipefail
+
+dir="$(dirname $(dirname $(dirname $(dirname "${0}"))))"
+
+source "$dir/teamcity-support.sh"
+source "$dir/teamcity-bazel-support.sh"
+
+BAZEL_SUPPORT_EXTRA_DOCKER_ARGS="-e BUILD_VCS_NUMBER -e GITHUB_API_TOKEN -e GITHUB_REPO -e TC_BUILDTYPE_ID -e TC_BUILD_BRANCH -e TC_BUILD_ID -e TC_SERVER_URL" \
+  run_bazel build/teamcity/cockroach/nightlies/cockroach_nightly_extra_stress_impl.sh

build/teamcity/cockroach/nightlies/cockroach_nightly_extra_stress_impl.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+
+# Copyright 2025 The Cockroach Authors.
+#
+# Use of this software is governed by the CockroachDB Software License
+# included in the /LICENSE file.
+
+set -euxo pipefail
+
+# These are provided as variables to test the script locally.
+BAZEL_CONFIG="${BAZEL_CONFIG:-ci}"
+ARTIFACTS_DIR="${ARTIFACTS_DIR:-/artifacts}"
+
+# TEST_PACKAGE_TARGETS is a space-separated list of package containing the
+# tests in test_to_run.
+export TEST_PACKAGE_TARGETS="//pkg/kv/kvnemesis:kvnemesis_test"
+
+# tests_to_run is a hand-curated list of tests that we want to run more often
+# under stress.
+#
+# PLEASE KEEP THIS LIST SHORT.
+declare -a tests_to_run=(
+  "TestKVNemesisMultiNode"
+  "TestKVNemesisMultiNode_BufferedWritesLockDurabilityUpgrades"
+)
+
+test_exists() {
+  git grep -q "func ${1}("
+}
+
+# This builds a filter string in the form of ^(TestName1|TestName2|...)$ to
+# ensure that we are only running the tests in the tests_to_run array.
+test_filter="^("
+sep=""
+for t in "${tests_to_run[@]}"; do
+  # We look for this test somewhere in the repository so we can fail the test if
+  # someone changes the name of a test without updating this file.
+  if ! test_exists "$t"; then
+    echo "could not find test ${t}"
+    exit 1
+  fi
+
+  test_filter="${test_filter}${sep}${t}"
+  sep="|"
+done
+test_filter="${test_filter})\$"
+
+export RUNS_PER_TEST=1000
+export TEST_ARGS="--test_timeout=25200 --runs_per_test $RUNS_PER_TEST"
+
+mkdir -p $ARTIFACTS_DIR
+
+bazel build //pkg/cmd/bazci
+
+BAZEL_BIN=$(bazel info bazel-bin)
+
+exit_status=0
+$BAZEL_BIN/pkg/cmd/bazci/bazci_/bazci -- test $TEST_PACKAGE_TARGETS \
+                                      --config=$BAZEL_CONFIG \
+                                      --test_env TC_SERVER_URL \
+                                      $TEST_ARGS \
+                                      --test_filter="$test_filter" \
+    || exit_status=$?
+
+exit $exit_status