Prettify docs-update.py

Remove commented code, use format for string concatenation, split long lines, fix how-to-run instructions
Signed-off-by: Davide Ceretti <dav.ceretti@gmail.com>
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>
Add ENV variables support to WORKDIR build command

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Docker-DCO-1.1-Signed-off-by: Adrien Folie <folie.adrien@gmail.com> (github: folieadrien)

Conflicts:
	builder/builder.go
		This file has been deleted.
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)
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>
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)
add test and move one from rm to rmi

Signed-off-by: Victor Vieux <vieux@docker.com>
Add comment for permission and fix wrong format variable

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
docs: Update `docker exec` examples

Signed-off-by: Fabio Rehm <fgrehm@gmail.com>
Add note to docs about lack of shell processing in JSON form

Closes #5509

Signed-off-by: Doug Davis <dug@us.ibm.com>
Merge pull request #8320 from dmcgowan/provenance_pull

Official image provenance pull flow
Merge pull request #8336 from kwk/improve_docs_with_note_about_registry_frontend_web_app

Improve docs with note about registry frontend web app
Fix #6231 - Accept chunked encoding on start

Docker-DCO-1.1-Signed-off-by: Brian Goff <cpuguy83@gmail.com> (github: cpuguy83)
Merge pull request #8324 from cpuguy83/6231_fix_chunked_encoding

Fix #6231 - Accept chunked encoding on start
Merge pull request #8375 from fgrehm/patch-2

docs: Update `docker exec` examples
Fixed a typo in "Installing Docker on Mac OS X"

evironment -> environment