Three changes:
1. CI: add set -e and fail-fast: true to stop on first molecule failure
instead of continuing (all pairs fail for same reason anyway)
2. Docker APT repo: use copy module to write sources.list directly
instead of apt_repository module which wasn't picking up the repo
3. Fix arch mapping: ansible_facts returns x86_64, Docker repo needs amd64
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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
