Shell executor

Known issue with job cancellation. Shell executor is using bash –login user and for every script: section another shell (bash) is spawned. In result proces tree looks like:

Default bash behavior is to ignore signals when waiting for child.

If bash is waiting for a command to complete and receives a signal for which a trap has been set, 
the trap will not be executed until the command completes. When bash is waiting for an asynchronous
command via the wait builtin, the reception of a signal for which a trap has been set will cause
the wait builtin to return immediately with an exit status greater than 128, immediately after which 
the trap is executed. 

The same issue described here:

• Canceling jobs in shell executor doesnt work

Some references:

• Forward SIGTERM to child in Bash
• Gracefully halt cancelled jobs