I have a case where I want to store everything in Azure DevOps (CI/CD, Scrum, Testing, Publishing), but I still want to host all the code on GitHub.
How do I mirror all branches/merges/commits/PRs/issues made in GitHub in Azure DevOps?
You can check out GitHub Actions, in particular Azure/github-actions (from the original repo actions/azure).
That allows, on GitHub events (like a push), to generate work on GitHUb side, that will interact with Azure.