Sailor enhancement: set custom timeout length with env variable

[hannah-bulmer]

Right now, Sailor has a static timeout time of 20 minutes, before it automatically calls a forceful program termination.

Two enhancements here could be made:

• throw an error in Sailor if the timeout time is ever reached, rather than quietly ending the program
• refactor the TIMEOUT value into an optional environment variable, with a default time of 20 minutes. The purpose of this is that the current timeout time is quite arbitrary, and may be useful in some situations to be able to change this value

Changes to make for this enhancement:

• make Sailor throw a descriptive error when the timeout has been reached
• add a SAILOR_TIMEOUT env variable to the settings with a default value of 20 minutes
• use this variable in the timeout functions instead of the static one
• investigate if anything on the platform side needs to be changed regarding environment variables???

[hannah-bulmer]

Investigate how much Admiral is affecting this timeout