Enable Multi-Architecture (amd64 + arm64) Docker Image Builds for SW360

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Enable Multi-Architecture (amd64 + arm64) Docker Image Builds for SW360

Problem Statement

Currently, SW360 Docker images appear to be built for linux/amd64 only.

On Apple Silicon (ARM64) systems, running:

docker compose up -d

results in:

no matching manifest for linux/arm64/v8 in the manifest list entries

While Docker Desktop allows emulation using:

platform: linux/amd64

this:
->Is undocumented
->Reduces performance due to emulation (QEMU)
->Creates onboarding friction for contributors
->Leads to repeated setup issues for Apple Silicon users
This is not a functional bug in SW360 itself, but rather a limitation in the current container build pipeline.

Root Cause Analysis

The published image:

ghcr.io/eclipse-sw360/sw360

does not appear to include a multi-architecture manifest list.
It is likely built using standard docker build on an amd64 runner instead of a multi-platform build using Docker Buildx.

As a result:

ARM64 hosts cannot pull a native image
Docker falls back to failure unless platform is explicitly forced

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I am interested in contributing to this enhancement.

Before starting implementation, I would appreciate feedback on whether this approach aligns with the project’s current CI/CD strategy and release workflow.

If approved, I can begin by investigating the existing Docker build pipeline and proposing a draft multi-architecture build configuration.