fix(supernova): resolve Docker multi-platform build failures with QEMU v4.2.0

[ArtieReus]

Summary

Fix Docker multi-platform build failures for Supernova caused by QEMU v4.2.0 incompatibility with native module compilation during pnpm install.

Changes Made

• Added --platform=$BUILDPLATFORM to Dockerfile build stage to use native host platform instead of QEMU emulation
• Added comments explaining why this change fixes the QEMU issue

Related Issues

• Root cause: QEMU v4.2.0 upgrade in commit e1cd93f (Aug 21) introduced incompatibility with @swc/core native builds
• Last successful build: commit 7d31786 (Aug 12) with QEMU v4.1.0
• Related to pnpm v11 upgrade (commit f2f7fde) which enabled native builds for @swc/core

Screenshots (if applicable)

N/A - Infrastructure change only

Testing Instructions

1. Trigger the workflow manually via GitHub Actions UI
2. Verify multi-platform build completes successfully for both linux/amd64 and linux/arm64
3. Pull and run the resulting images on both architectures to confirm they work correctly

Or test locally:

cd /Users/D063222/Documents/sap/cloudoperators/juno
docker buildx build --platform linux/amd64,linux/arm64 -f apps/supernova/docker/Dockerfile -t supernova-test .

Checklist

- [x] I have performed a self-review of my code.
- [x] I have commented my code, particularly in hard-to-understand areas.
- [ ] I have added tests that prove my fix is effective or that my feature works.
- [ ] New and existing unit tests pass locally with my changes.
- [ ] I have made corresponding changes to the documentation (if applicable).
- [x] My changes generate no new warnings or errors.
- [ ] I have created a changeset for my changes.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 661f3d5

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[Copilot]

Pull request overview

Fixes Supernova’s multi-platform Docker builds by ensuring the dependency-install/build step runs on the builder’s native architecture (avoiding QEMU emulation issues during pnpm install / native module compilation).

Changes:

• Adds --platform=$BUILDPLATFORM to the build stage FROM to build on the host platform.
• Adds explanatory comments describing why the build stage is pinned to the build platform.

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