test new workflows

[enaut]

No description provided.

[Copilot]

Pull Request Overview

This PR restructures the Docker build process by removing local cross-compilation Dockerfiles and the Cross.toml configuration in favor of dedicated GitHub Actions workflows for each architecture and a multi-arch manifest step.

• Removed cross-*.Dockerfile and Cross.toml entries to deprecate local cross builds
• Added build_docker_x86_64.yml and build_docker_arm64.yml workflows for separate AMD64 and ARM64 image builds
• Introduced create_multiarch_image.yml to combine built images into a multi-architecture manifest and updated the workflow README

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
cross-x86_64.Dockerfile	Deleted local x86_64 cross-compilation Dockerfile
cross-aarch64.Dockerfile	Deleted local aarch64 cross-compilation Dockerfile
Cross.toml	Removed cross-rs build environment and target configurations
.github/workflows/create_multiarch_image.yml	New job to assemble and push a multi-arch Docker manifest
.github/workflows/build_docker_x86_64.yml	Updated to a reusable workflow for x86_64 builds
.github/workflows/build_docker_arm64.yml	New ARM64 build-and-push workflow
.github/workflows/README.md	Added documentation for the new split workflows

Comments suppressed due to low confidence (5)

.github/workflows/build_docker_arm64.yml:23

• The runner label 'ubuntu-24.04-arm' is not a supported GitHub-hosted runner. Use a valid label like 'ubuntu-22.04' or 'ubuntu-latest' with an ARM runner.

    runs-on: ubuntu-24.04-arm

.github/workflows/build_docker_arm64.yml:92

• The referenced Dockerfile './aarch64.Dockerfile' does not exist in the repo. Update the path to the correct filename or restore the missing Dockerfile.

          file: ./aarch64.Dockerfile

.github/workflows/build_docker_arm64.yml:70

• [nitpick] Using a hyphen in the output variable name 'repo-owner' can complicate references. Consider using an underscore (e.g., 'repo_owner') for consistency and easier use.

          echo "repo-owner=$(echo ${{ github.repository_owner }} | tr 'A-Z' 'a-z')" >> $GITHUB_OUTPUT

.github/workflows/README.md:1

• [nitpick] The README mixes German and English. Standardize on a single language to ensure clarity for all contributors.

# GitHub Actions Workflow-Aufteilung

.github/workflows/build_docker_x86_64.yml:13

• [nitpick] The 'workflow_call' inputs and version–repo-owner setup are duplicated across both architecture workflows. Consider extracting common steps into a shared reusable workflow or composite action.

  workflow_call: