Edits and fixes to Dockerfile Best Practices based on review feedback.

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: fredlf)
Create registry_api_client_libraries.md
Signed-off-by: Konrad Kleine <konrad.wilhelm.kleine@gmail.com>
Add registry_api_client_libraries.md to mkdocs.yml

Signed-off-by: Konrad Kleine <konrad.wilhelm.kleine@gmail.com>
registry: getting Endpoint ironned out

Signed-off-by: Vincent Batts <vbatts@redhat.com>
Update libtrust version

Updated to version of libtrust with the trust graph implementation

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
Print a status message when pull command is executed
Using repo tag in the status message for better usability, as per review comments
Added documentation and Changed code to print Status after downloads are complete

Addresses #2404

Signed-off-by: Srini Brahmaroutu <srbrahma@us.ibm.com>
Fixed issue with docs not getting built due to ssl error.
Signed-off-by: Ken Cochrane <ken@docker.com>
Add provenance pull flow for official images

Add support for pulling signed images from a version 2 registry.
Only official images within the library namespace will be pull from the
new registry and check the build signature.

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
Typo: changed "Maintainers" to "maintainers"

Signed-off-by: Konrad Kleine <konrad.wilhelm.kleine@gmail.com>
Added validity checks for repo name and tag in build job.
Signed-off-by: Joffrey F <joffrey@docker.com>
Merge pull request #8213 from brahmaroutu/pull_status_2404

Print a status message when pull command is executed
add bash completion support for pause and unpause

Signed-off-by: Michael Scharf <github@scharf.gr>
Edits and fixes to Dockerfile Best Practices based on review feedback.

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: fredlf)
Optimize the bash completion even further

The biggest/bestest change here is cutting down on the number of calls to Docker in the filtering helpers (`__docker_containers_running`, etc), especially calls to the really heavy `docker images`.

Signed-off-by: Andrew Page <admwiggin@gmail.com>
Merge pull request #8358 from docker/6969-reponame-rest-api

Added validity checks for repo name and tag in build job
Merge pull request #8364 from tianon/bash-completion-filters

Optimize the bash completion even further
Update libconatiner to b3570267c7b7995d5d618974d8f

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Merge pull request #8367 from crosbymichael/update-libcontainer-sep9

Update libconatiner to b3570267c7b7995d5d618974d8f
docker rm <unknown>

Signed-off-by: Victor Vieux <vieux@docker.com>
Merge pull request #8351 from kencochrane/8347_fix_broken_doc_build

Fixed issue with docs not getting built due to ssl error.