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666bbfdbd5
Introduce environment variables for key CI/CD flags so that self-hosted
runners (e.g. GitHub Actions) can configure registry mirrors and push
targets without modifying calling Makefiles:
- LINUXKIT_MIRROR - equivalent to --mirror (space/comma-separated);
CLI flags take precedence (last SetProxy wins)
- LINUXKIT_PKG_ORG - equivalent to --org for all pkg subcommands
- LINUXKIT_BUILDER_IMAGE - equivalent to --builder-image
- LINUXKIT_BUILDER_CONFIG - equivalent to --builder-config
All env var constants are consolidated in pkg_build.go alongside the
existing LINUXKIT_CACHE, LINUXKIT_BUILDER_NAME, LINUXKIT_BUILDERS.
Priority for all: CLI flag > env var > built-in default
Adds a new Environment Variables section to docs/packages.md with a
reference table covering all LINUXKIT_* vars and a note explaining the
two-layer mirror configuration required in CI (linuxkit pulls vs
buildkit Dockerfile pulls).
Signed-off-by: Roman Shaposhnik <rucoder@gmail.com>
Signed-off-by: Mikhail Malyshev <mike.malyshev@gmail.com>