Integrate FerretDB testing with SQLite

[Alexey Palazhchenko]

Let's start by thinking (or completely rethinking) the YAML structure. Could we use YAML anchors or something? or just some common section?

[b1ron]

I think the simplest approach would be to treat different backends as different databases.

results:
  # new service
  ferretdb-postgres:
    stats:
      expected_fail: 1
    fail:
      - mongo/jstests/core/query/basic1.js
  # another new service
  ferretdb-sqlite:
    stats:
      expected_fail: 1
    fail:
      - mongo/jstests/core/query/basic1.js

  mongodb:
    stats:
      expected_pass: 8

[b1ron]

@AlekSi should I send a draft PR with a small implementation?

[Alexey Palazhchenko]

Not yet; I want us to refactor config loading and parsing first