Release of stable artefacts through CI

[tobrun]

With the move from Bitrise to Circle CI in #8551 we lost the ability to use our CI to publish stable releases. We used to do this by executing scripts/release.py on our development machines. This script would take care of creating a release branch, pushing release related changes and triggering a build on CI. We should look into reintegrating this script into Circle CI or find another way of doing automated releases.

cc @zugaldia

[kkaefer]

Noting here that Circle CI also supports triggered builds. Additionally, Circle CI also publishes the release APK at https://circleci.com/gh/mapbox/mapbox-gl-native/1837#artifacts/containers/0

[zugaldia]

Looks like CircleCI has the right API for this:

POST: /project/:vcs-type/:username/:project/tree/:branch
Triggers a new build, returns a summary of the build. Optional build parameters can be set as well.

I can look into updating the Bitrise API call to CircleCI before 5.1.0-beta2.

[tobrun]

This landed with #8950, closing