Sign-in to the Mobile app [hardware steel-thread]

[JSegrave-IBM]

"As a Firefighter, I need authentication security that lets me sign into the Mobile app and keeps out unauthorised users".

Can only sign in if:

• User has an account with the IDaaS service
• User is registered with Prometeo
• User role in Prometeo is 'Firefighter User'

Anything else and the mobile app should give an 'access denied' error.

Note - for this steel thread epic, the goal is minimal - one user can sign in. This is just to enable any phone / IDaaS integration issues to be discovered as early as possible. More sign-in and security related functionality will come in subsequent epics.

See story #96 for similar configuration on the web app side.