Add an SSH key to environment variable like CI_BUILD_TOKEN

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Description

Git mainly uses SSH for authentication. In many cases using HTTPS authentication requires extra configuration and workarounds. Currently gitlab adds CI_BUILD_TOKEN to the environment which can be used to authenticate. This means tools (like) composer must be properly configured to not use SSH as a transport.

Proposal

My proposal is to not only add a CI_BUILD_TOKEN, but also a CI_BUILD_KEY. This key could then be used by the build process to perform SSH authentication. Permissions for the key would mirror permissions for the CI_BUILD_TOKEN.