System design interview question
"Design GitHub Actions. Users define workflows in a file in their repository; when events happen — a push, a pull request — those workflows run on machines you provide. The code you are executing is arbitrary and written by strangers. Millions of workflow runs a day."
executing untrusted code safely at scale, which makes it fundamentally different from an internal CI system. The distinguishing content is: isolation between tenants, the supply-chain risk of reusable third-party actions, secret handling when the workflow author controls the code, and scheduling a huge fleet of ephemeral machines economically.
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