docker: set the master branch as the latest tag

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.48%. Comparing base (9fe9233) to head (f4c6617).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2159 +/- ## ======================================= Coverage 95.48% 95.48% ======================================= Files 18 18 Lines 1461 1461 ======================================= Hits 1395 1395 Misses 66 66 ```

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