Fix CI

[pawlooss1]

This PR fixes 2 problems that came out after recent merge to master - https://app.circleci.com/pipelines/github/esl/MongoosePush/1220/workflows/e6b325b1-022b-4fb1-8f26-f3d5adfa2d46.

• some ubuntu CI images are being deprecated - source
• docker image could not be built, I used debian:stable-slim instead of debian:sid-slim for better stability