bdcs-api-server is probably leaking memory

[atodorov]

It looks like the API server may be leaking memory.

Steps to reproduce:

1. Start the API container, make a note of the amount of used memory
2. Start welder-web and run the e2e test suite against the Haskell backend. I repeat this a few times while I'm working on the e2e test suite.

After a few executions (around 3 usually) I notice that the API server is taking a lot more memory than it used to:

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                               
30432 root      20   0  1,011t 4,427g   9928 S   0,3 58,7   5:58.92 bdcs-api-server  

This is on a system with 8GB RAM (using 55% according to top). After all the tests are done the memory usage stays pretty much the same.