Look at Symfony way to manage it.
Keep in mind there's two files :
A local one : parameters.yml -> you store api key used for code.
A distant one : parameters.dist.yml -> you store default value like 'toOverride'
When you pull a new parameters.dist.yml version, you have to modify your local parameters.yml manually or by using "composer install" in CLI.
This solution scale with every project, new staff just have to copy your parameters.yml (using a chat or irl) and modify for their own usage.
Any file with personnal information should not be pushed to repo, even if it's private !
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