The Build Cache Was Not Broken
Docker cache problems are often Dockerfile problems: unstable inputs, bad COPY order, and layers that depend on too much.
CI
Runners, workflows, flaky tests, and the slow realization that CI is a distributed system with invoices. What breaks, what costs money, and what to do about it.
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The CI Pipeline Nobody Owns
Your CI pipeline builds the same Docker image three times, a dependency bot eats your runner fleet, and nobody fixes it because nobody owns the system.