Another technique to debug build time issues is by running a debug build in Travis CI. You need to email support@travis-ci.com to toggle this feature on for public repositories while private repositories have the debug mode enabled by default. The reason for this is that anyone can come across a log containing the SSH access and can then make a connection to the virtual machine and then potentially read out secret environment information, such as client IDs, secrets, and more.
Running build in debug mode
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