Enable health checks for ui & server

[psturc]

Notes/questions

• Removed this task (also from sync-ui), since we're testing hostname accessibility in provision test
• What it this variable for? Will it have any use in a future?

[darahayes]

Thanks for this PR @psturc! Just to address your two points:

• This is how it's been done in other APBs, but I'm cool with this task being removed.
• This variable changes what port the server starts up on (inside the pod) although it's probably not necessary.