Add possibility to specify memory in Docker containers

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What does this MR do?

Adds possibility to specify Memory, MemorySwap and MemoryReservation for docker containers created by runners.

Why was this MR needed?

See #1582 (closed).

Are there points in the code the reviewer needs to double check?

Are more tests necessary?

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Tests
  • Added for this feature/bug
  • All builds are passing
• Branch has no merge conflicts with master (if you do - rebase it please)

What are the relevant issue numbers?

#1582 (closed) !702 (closed)