Documentation for Environment Variable based Secret Passing

[chirangaalwis]

Problem description

Support for passing Secrets via environment variables is available in the Docker client. This needs to be properly documented.

Problem location

The documentation relevant to the issue -> New Docker Build secret information

Project version(s) affected

From Docker Client version 19.03.13 onwards as per docker/cli#2656. Please correct me if I am wrong.

Suggested assignee

@thaJeztah

[TBBle]

I think the CLI support from that linked PR is only in 20.10.0 onwards. moby/moby#41234 for the daemon side also reports 20.10.0.

[docker-robott]

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