Remove deprecated Docker Content Trust ENV passphrase variables #22574
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Since 1.9, Docker Content Trust Offline key has been renamed to Root key and the Tagging key has been renamed to Repository key.
The corresponding environment variables
DOCKER_CONTENT_TRUST_OFFLINE_PASSPHRASE
DOCKER_CONTENT_TRUST_TAGGING_PASSPHRASE
have also been deprecated and renamed to
DOCKER_CONTENT_TRUST_ROOT_PASSPHRASE
DOCKER_CONTENT_TRUST_REPOSITORY_PASSPHRASE
This fix removed the deprecated ENV passphrase variables for 1.12 and updated the docs.
Signed-off-by: Yong Tang yong.tang.github@outlook.com