feat: add --replace-cert-domains flag to renew #2355
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Closes #1532
When changing the --domains values, the certificate will not be refreshed to update the SANs appropriately.
This change introduces a simple flag to check + enforce that the domains specified match exactly those in the certificate during renewal.
I couldn't see a straightforward way to contribute a unit test for this, but I performed a full integration test using the NixOS ACME integration test suite. You can run that test locally with this command:
nix run github:m1cr0man/nixpkgs/lego-domain-testing#nixosTests.acme