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docker-docs/develop/develop-images
Nathan Long 6e89c9daa3 Clarify that --ssh default uses $SSH_AUTH_SOCK (#12472)
* Clarify that `--ssh default` uses `$SSH_AUTH_SOCK`

I surmised this from [this post](https://medium.com/@tonistiigi/build-secrets-and-ssh-forwarding-in-docker-18-09-ae8161d066) and experimentation shows that the two commands do the same thing.

* Rework section to be more step-by-step

* Describe namespacing sockets

* PR feedback
2022-01-19 23:29:33 +05:30
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