tests/bsim/run_parallel: Create folder for results xml if missing
Create the folder for the results if it does not exist.
Fixes these warnings in CI:
```
touch: cannot touch '/__w/zephyr/zephyr/./bsim_bt/
53_bsim_results.xml': No such file or directory
realpath: /__w/zephyr/zephyr/./bsim_bt/
53_bsim_results.xml: No such file or directory
```
Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
diff --git a/tests/bsim/run_parallel.sh b/tests/bsim/run_parallel.sh
index 80e7451..cb9a3d4 100755
--- a/tests/bsim/run_parallel.sh
+++ b/tests/bsim/run_parallel.sh
@@ -63,6 +63,8 @@
all_cases_a=( $all_cases )
n_cases=$((${#all_cases_a[@]}))
+
+mkdir -p $(dirname ${RESULTS_FILE})
touch ${RESULTS_FILE}
echo "Attempting to run ${n_cases} cases (logging to \
`realpath ${RESULTS_FILE}`)"
