asked 3 months ago
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Every build reinstalls all dependencies even when I only edited one component. My Dockerfile:
COPY . . invalidates the cache for every layer beneath it whenever any file changes — including your one component. So npm ci reruns every time.
Copy the manifests first, install, then copy the source:
Now the install layer is only invalidated when the lockfile changes.
Add a .dockerignore too — without it node_modules and .next get sent to the daemon and can bust the cache through mtime changes alone:
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