WP-CLI builds are stored in two places, here and the releases page.
This repo has the latest stable (phar/wp-cli.phar) and latest nightly (phar/wp-cli-nightly.phar). It also has Debian builds for each release.
The latest nightly represents HEAD on the project repo, as built by Travis.
Starting from v1.5.1 onwards, stable builds are signed with this GPG key:
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