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Tidy up Dockerfile and GitLab pipeline

Misha Gusarov requested to merge misha/slim-docker-image into master

Description

  • Push options & code from GitLab pipeline to Dockerfile

  • Push options & code from Dockerfile to CMake

    • Fix compilation warning found during this rework

  • Add "test release build" job for every CI run to avoid unpleasant failures on release.

  • Trim Docker image: only leave build artifacts there, thus slimming it down to 250MB

  • Add a check that built artifacts can actually be run

    • Add --help to rumba for this

  • Merge build & test stages to save several minutes of build (docker push && docker pull are slow on GitLab)

The result is ~6m build that

  • checks source code formatting
  • builds source code in 3 different configurations
  • runs unit tests
  • runs integration tests
  • checks that release Docker image can be built

Validation

  • All jobs build just fine

Issues addressed

Related to #92 (closed)

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