feat: support pre-defined build args of multi-platform build arguments

[kit101]

…ents

Fixes # in case of a bug fix, this should point to a bug and any other related issue(s)

Description

Support pre-defined build arguments, similarly to docker Pre-defined build arguments / Multi-platform build arguments

/workspace # cat Dockerfile
FROM alpine:3

ARG TARGETPLATFORM
ARG TARGETOS
ARG TARGETARCH
ARG TARGETVARIANT

ARG BUILDPLATFORM
ARG BUILDOS
ARG BUILDARCH

RUN echo $BUILDPLATFORM, $BUILDOS $BUILDARCH

RUN echo $TARGETPLATFORM, $TARGETOS $TARGETARCH $TARGETVARIANT

COPY release/$TARGETOS/$TARGETARCH/bin /usr/local/bin/bin

/workspace # executor --no-push -d docker.io/library/example --custom-platform linux/arm/v6
INFO[0000] Retrieving image manifest alpine:3
INFO[0000] Retrieving image alpine:3 from registry index.docker.io
INFO[0003] Built cross stage deps: map[]
INFO[0003] Retrieving image manifest alpine:3
INFO[0003] Returning cached image manifest
INFO[0003] Executing 0 build triggers
INFO[0003] Building stage 'alpine:3' [idx: '0', base-idx: '-1']
INFO[0003] Unpacking rootfs as cmd RUN echo $BUILDPLATFORM, $BUILDOS $BUILDARCH requires it.
INFO[0003] ARG TARGETPLATFORM
INFO[0003] ARG TARGETOS
INFO[0003] ARG TARGETARCH
INFO[0003] ARG TARGETVARIANT
INFO[0003] ARG BUILDPLATFORM
INFO[0003] ARG BUILDOS
INFO[0003] ARG BUILDARCH
INFO[0003] RUN echo $BUILDPLATFORM, $BUILDOS $BUILDARCH
INFO[0003] Initializing snapshotter ...
INFO[0003] Taking snapshot of full filesystem...
INFO[0003] Cmd: /bin/sh
INFO[0003] Args: [-c echo $BUILDPLATFORM, $BUILDOS $BUILDARCH]
INFO[0003] Running: [/bin/sh -c echo $BUILDPLATFORM, $BUILDOS $BUILDARCH]
linux/amd64, linux amd64
INFO[0003] Taking snapshot of full filesystem...
INFO[0003] No files were changed, appending empty layer to config. No layer added to image.
INFO[0003] RUN echo $TARGETPLATFORM, $TARGETOS $TARGETARCH $TARGETVARIANT
INFO[0003] Cmd: /bin/sh
INFO[0003] Args: [-c echo $TARGETPLATFORM, $TARGETOS $TARGETARCH $TARGETVARIANT]
INFO[0003] Running: [/bin/sh -c echo $TARGETPLATFORM, $TARGETOS $TARGETARCH $TARGETVARIANT]
linux/arm/v6, linux arm v6
INFO[0003] Taking snapshot of full filesystem...
INFO[0003] No files were changed, appending empty layer to config. No layer added to image.
INFO[0003] COPY release/$TARGETOS/$TARGETARCH/bin /usr/local/bin/bin
INFO[0003] Taking snapshot of files...
INFO[0003] Skipping push to container registry due to --no-push flag

Submitter Checklist

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review them:

• Includes unit tests
• Adds integration tests if needed.

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Reviewer Notes

• The code flow looks good.
• Unit tests and or integration tests added.

Release Notes

• Support pre-defined build arguments, similarly to docker Pre-defined build arguments / Multi-platform build arguments

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[kit101]

@aaron-prindle
please review code