oci_image: paths.relativize fails on Windows ARM64 in _maybe_wrap_launcher_for_windows

[carlosmiguel84]

Description

oci_image fails on Windows ARM64 with a path relativization error:

ERROR: Analysis of target '//apps/budget-tracker/src/Handlers:pipeline_image' failed
Error in fail: Path 'external/rules_oci+/oci/private/descriptor.sh' is not beneath 
'bazel-out/arm64_windows-fastbuild/bin/apps/budget-tracker/src/Handlers'

Root cause

oci/private/util.bzl:227 in _maybe_wrap_launcher_for_windows:

launcher = paths.relativize(bash_launcher.path, win_launcher.dirname)

On Windows ARM64, the bash launcher path (external/rules_oci+/oci/private/descriptor.sh) and the output directory (bazel-out/arm64_windows-fastbuild/bin/...) don't share a common prefix that bazel_skylib's paths.relativize can resolve.

Environment

• rules_oci: 2.3.0
• Bazel: 8.x
• Host: Windows 11 ARM64
• The same code works on Linux x86_64, Linux ARM64, macOS ARM64, and Windows x86_64.
• Only Windows ARM64 (bazel-out/arm64_windows-fastbuild) is affected.

Workaround

None — oci_image can't be used on Windows ARM64 as of v2.3.0.