Fix: google-cloud CLI installation script to use gpg for key import #36
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Fixes #35
Description
This PR fixes the Google Cloud CLI installation script to work with modern Ubuntu/Debian systems by replacing the deprecated apt-key command with the recommended gpg approach.
Problem
The current installation script fails on Ubuntu 22.04+ with the error:
apt-key: command not found
Solution
Replaced apt-key usage with gpg --dearmor to properly handle GPG key import
ref. https://github.com/google-research/google-research/blob/46fe0fb7a0e36611b2ade273819ce35b0bd1ccc4/learning_to_clarify/Dockerfile#L20