Updated CI with circle and codecov
This PR upgrades the CI as follows
- all jobs now run on circleCI
- coverage now provided by codecov
Maintenance will be performed on git.ligo.org, containers.ligo.org, and docs.ligo.org on Tuesday 24 September 2024 starting at approximately 9am PDT. It is expected to take around 30 minutes and there will be several periods of downtime throughout the maintenance. Please address any comments, concerns, or questions to the helpdesk.
This PR upgrades the CI as follows