ci: run-pytest.sh: allow script to run locally

Currently, run-pytest.sh won't run locally outside of a pipeline
because it can't find the `setup-test-env.sh` which provides necessary
functions.

Add a default value for the SCRIPTS_DIR so that run-pytest can find and
run the setup-test-env.sh and be run locally outside of a pipeline.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32602>

.gitlab-ci/run-pytest.sh

@@ -7,16 +7,29 @@
 # shellcheck disable=SC1091 # The relative paths in this file only become valid at runtime.
 # shellcheck disable=SC2086 # quoting PYTEST_VERBOSE makes us pass an empty path
 
-. "${SCRIPTS_DIR}/setup-test-env.sh"
+set -eu
+
+if [ -z "${SCRIPTS_DIR:-}" ]; then
+    SCRIPTS_DIR="$(dirname "${0}")"
+fi
+
+if [ -z "${CI_JOB_STARTED_AT:-}" ]; then
+    CI_JOB_STARTED_AT=$(date -u +%Y-%m-%dT%H:%M:%SZ) # isoformat
+fi
+
+source "${SCRIPTS_DIR}/setup-test-env.sh"
 
 section_start pytest_setup "Setting up pytest environment"
 
-set -exu
-
 if [ -z "${CI_PROJECT_DIR:-}" ]; then
     CI_PROJECT_DIR="$(dirname "${0}")/../"
 fi
 
+if [ -z "${CI_JOB_TIMEOUT:-}" ]; then
+    # Export this default value, 1 hour in seconds, to test the lava job submitter
+    export CI_JOB_TIMEOUT=3600
+fi
+
 if [ -z "${MESA_PYTEST_VENV:-}" ]; then
     MESA_PYTEST_VENV="${CI_PROJECT_DIR}/.venv-pytest"
 fi