Set up release publishing for Android

[RiccardoM]

Description

Implemented the automatic deployment of a new Android version in the internal channel each time a new commit is done on the master.

References #42

Checklist

• [x] Targeted PR against correct branch.
• [x] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• [ ] Wrote unit tests.
• [ ] Run flutter format.
• [ ] Updated the documentation.
• [ ] Added an entry to the CHANGELOG.md file.
• [ ] Re-reviewed Files changed in the Github PR explorer.

[codecov[bot]]

Codecov Report

Merging #49 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #49   +/-   ##
=======================================
  Coverage   18.17%   18.17%           
=======================================
  Files         245      245           
  Lines        5965     5965           
=======================================
  Hits         1084     1084           
  Misses       4881     4881           

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