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Updated Configuration (markdown)
Add example of available envvars.
Added documentation for automatic passthrough of cargo and cross envvars.
Document `CROSS_CONTAINER_ENGINE_NO_BUILDKIT`.
Added documentation on using zig cc.
Added `CROSS_CUSTOM_TOOLCHAIN_COMPAT` documentation.
Update for the new images for other toolchaibs/platforms and pre-build support.
Update the runner to use valid values.
Add examples of annotated config files.
Add examples file and fix documentation for `CROSS_CONFIG`.
Remove passthrough for `CARGO_TARGET...` since we automatically passthrough those variables now.
Added `CROSS_CONTAINER_USER_NAMESPACE`.
Add `CROSS_ROOTLESS_CONTAINER_ENGINE`.
Added documentation on remote container engine support, and Cargo.toml metadata.
Add documentation for custom images from config, and CROSS_DEB_ARCH.
Add documentation for `CROSS_CUSTOM_TOOLCHAIN` and `CARGO_BUILD_TARGET`.
Update to use `CROSS_CONTAINER_IN_CONTAINER` rather than `CROSS_DOCKER_IN_DOCKER`.
Added documentation for build-std.
Changed `DOCKER_OPTS` in documentation to `CROSS_CONTAINER_OPTS`.
Added extra comments for variable usage.
Added additional documentation for how the volume values are evaluated, and other fixes.
Added updates to passthrough variable definitions due to #748.
Add small documentation header
Add references to FAQ for environment variables.
Add cargo configuration information.