Clean up from #3

[lewisjared]

Description

General cleanup from @znicholls suggestions in #3. The pipeline is now (tentatively) working

Checklist

Please confirm that this pull request has done the following:

• Tests added
• Documentation added (where applicable)
• Changelog item added to changelog/

[lewisjared]

Interesting things learnt along the way:

• Need to remember that there are two versions in the pyproject.toml (poetry + PEP621). Using sed to update both instead of poetry version
• I learnt how to reuse a workflow (the release workflow using the wheels workflow)
• Hard to get feedback in a reasonable time period
• qemu arch emulation (linux) is 10x slower than native. Looking forward to the GA of arm-based linux runners - alternatively could build on Mac

[znicholls]

• I learnt how to reuse a workflow (the release workflow using the wheels workflow)

Nice trick

• Hard to get feedback in a reasonable time period

Just cause CI is slow?

• qemu arch emulation (linux) is 10x slower than native

Can we build without emulation for now (we don't have many linux users yet anyway...)