Please allow forks to inherit secure variables
### Description From https://disqus.com/home/discussion/gitlab-docs/group_level_variables_api_gitlab_documentation/#comment-3603674982 ### Proposal We use variables to login into docker repository and provide some sensitive information like private keys. For any new fork of repository we enforced manually copy/paste it to allow CI work in forks too. Please allow something like setting on variable "available on forks".
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