Local testing doesn't tend to work outside the small scale. Even if you use containers for everything you'll run into edges where a local development machine ca

Local testing doesn't tend to work outside the small scale. Even if you use containers for everything you'll run into edges where a local development machine can't accurately test a production-like environment. Deploying to production without testing in that environment is just tragedy waiting to happen. Distributed signing of artifacts is only effective if you've got fully reproducible builds. If you don't, because almost no one does because it is a huge effort, then all you have is attestation. If a broken/malicious artifact gets deployed the damage gets done and you only know who to blame afterwards. Local tests are useful for not knowingly committing broken code insofar as your tests can determine. Outside of that a full test suite run by a beefy cluster with ready access to assets and network resources is better suited to test for deployment.