fix: add QEMU for ARM64 image builds and fix workflow_dispatch trigger

[hk60418]

Related Issue(s):

No related issues were found.

Description:

Fix multi-platform Docker builds to include ARM64 images:

• Add docker/setup-qemu-action for ARM64 emulation
• Fix workflow_dispatch indentation (was incorrectly nested under push)

PR Checklist:

Pre-commit checks and tests were passed as the change has no impact/coverage on them. Regrettably I was also not able to run the workflow itself on my account.

• pre-commit hooks pass locally
• Tests pass (run make test)
• Documentation has been updated to reflect changes, if applicable, and docs build successfully (run make docs)
• Changes are added to the CHANGELOG.