Add ARM builds

[espenhgn]

Fixes #54

Changes proposed in this pull request:

• Add Docker builds for linux/arm64 platform (support recent Macs)

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[Copilot]

Pull request overview

Adds multi-architecture container builds to publish linux/arm64 images (in addition to linux/amd64) to better support ARM-based developer machines (e.g., Apple Silicon).

Changes:

• Enable multi-platform Docker builds/pushes for linux/amd64 and linux/arm64.
• Adjust Docker image tagging rules generated by docker/metadata-action.
• Bump the template version patch number.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 6 comments.

File	Description
version/version.py	Bumps patch version (0.1.0 → 0.1.1).
.github/workflows/container_build_push.yml	Publishes multi-arch Docker images and adjusts tag generation.
.github/workflows/container_build.yml	Builds (including in PR CI) for both amd64/arm64 and adjusts tag generation.

[espenhgn]

@copilot apply changes based on the comments in this thread

[Copilot]

@copilot apply changes based on the comments in this thread

Applied in commit 8794b49. I updated the workflow files to restore type=semver,pattern={{major}}, fixed multi-platform build usage with load in container_build.yml (single-platform for the loaded test image, multi-platform build without load), and normalized the multi-platform list formatting where needed. No UI changes were made (workflow-only change), so there is no UI screenshot to provide.