Add Dinesh Subhraveti to MAINTAINERS

Docker-DCO-1.1-Signed-off-by: Dinesh Subhraveti <dineshs@altiscale.com> (github: dineshs-altiscale)
Merge pull request #6060 from dineshs-altiscale/maintainers

Add Dinesh Subhraveti to MAINTAINERS
Docs: Fixed logged-in header username label target
Docker-DCO-1.1-Signed-off-by: O.S. Tezer <ostezer@gmail.com> (github: ostezer)
Added highlight for the COPY instruction

Docker-DCO-1.1-Signed-off-by: Asbjorn Enge <asbjorn@hanafjedle.net> (github: asbjornenge)
Merge pull request #6361 from asbjornenge/tmlang_copy

Add contribute/syntax highlight for the COPY instruction
Merge pull request #6372 from ostezer/docs-fix-logged-in-hdr

Docs: Fixed logged-in header username label target
server: buildfile: add NOCACHE instruction

This patch adds the `NOCACHE` instruction to the Dockerfile instruction
set. Basically, the NOCACHE instruction will disable the cache for all
subsequent instructions in the Dockerfile.

Docker-DCO-1.1-Signed-off-by: Aleksa Sarai <cyphar@cyphar.com> (github: cyphar)
docs: sources: reference: builder: add NOCACHE instruction docs

This patch adds the relevant reference documentation for the
new `NOCACHE` instruction.

Docker-DCO-1.1-Signed-off-by: Aleksa Sarai <cyphar@cyphar.com> (github: cyphar)
integration-cli: *: added tests for NOCACHE

This patch adds integration-cli tests for the `NOCACHE` instruction,
ensuring that the instruction really isn't cached by docker.

Docker-DCO-1.1-Signed-off-by: Aleksa Sarai <cyphar@cyphar.com> (github: cyphar)
contrib: syntax: add syntax highlighting for NOCACHE

This patch adds the syntax highlighting for the new NOCACHE instruction.

Docker-DCO-1.1-Signed-off-by: Aleksa Sarai <cyphar@cyphar.com> (github: cyphar)