ci: Fail shippable if something fails catastrophically
ci: Fail shippable if something fails catastrophically

Before run_ci.sh was introduced, if some command in the
.shippable.yml script failed, Shippable would stop and report
a failure.
When run_ci.sh was introduced we lost this, which is pretty
dangerous if something fails cathastrophically and the xml
reports are not (properly) generated and copied, as then
Shippable reports a pass.
=> Run run_ci.sh in -e mode, so we propagate a bad failure upwards

Signed-off-by: Alberto Escolar Piedras <52be3174920ed06cbdfbcf9622a1a6c68e942617@oticon.com>

punitvara/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,galak/zephyr,Vudentz/zephyr,finikorg/zephyr,Vudentz/zephyr,Vudentz/zephyr,nashif/zephyr,Vudentz/zephyr,finikorg/zephyr,ldts/zephyr,punitvara/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,explora26/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,ldts/zephyr,finikorg/zephyr,explora26/zephyr,finikorg/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,punitvara/zephyr,galak/zephyr,nashif/zephyr,explora26/zephyr,nashif/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,finikorg/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,punitvara/zephyr