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In addition to any caps, it’s important to take any additional hosting costs into account.
In GitHub’s case, free usage is capped at 1GB per month for bandwidth and 1GB of storage.
Bandwidth and storage are likely measured: Git LFS is a bandwidth and storage intensive service, and as such, there are likely charges associated with both when heavily utilizing it. An alternative approach is the use of machine users, or separate user accounts that the SSH key can be used with. The payment card will then be charged at the end of each month for any usage accrued.
GitHub deployment keys are not supported: SSH keys are handled in various ways within GitHub, and usage of LFS via deployment key is not currently supported. You will need to enter a form of payment, such as a credit or debit card, in order to sign up to Cloud Build 2.0. Some other notes should be taken into consideration: In order to use a Git LFS host with Unity Cloud Build, they must allow authorization for it via SSH. There are other services that also offer Git LFS support, however they do not currently support using LFS with SSH keys. GitHub is the source of the Git LFS project, and as such is the most prominent server implementation at this time.