Build and sign AABs on main automatically

[nkalupahana]

• [x] Code Review
• [x] Test with Internal App Sharing

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 3adbb3e):

• https://getbaselineapp--pr412-android-release-buil-9bfzu5pj.web.app
• https://baseline-links--pr412-android-release-buil-rwzbfuji.web.app

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