Automatically publish docker image

[pajlada]

Pull request checklist:

• CHANGELOG.md was updated, if applicable

Description

Automatically publish docker image to GitHub Container Registry

[codecov]

Codecov Report

Merging #279 (1b977bd) into master (b8b4f57) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #279   +/-   ##
=======================================
  Coverage   28.97%   28.97%           
=======================================
  Files          43       43           
  Lines        1101     1101           
=======================================
  Hits          319      319           
  Misses        744      744           
  Partials       38       38           

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