What this snippet does
Exporting the cache to a registry lets ephemeral CI runners reuse layers between jobs.
Expected output
=> CACHED [build 3/6] RUN npm ci
Why practise typing this
Typing buildkit & buildx code builds muscle memory for the symbols and indentation Docker uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
More Docker practice
- Bind mount during buildBuildKit & Buildx · advanced
- Building for two architecturesBuildKit & Buildx · advanced
- Using build platform argsBuildKit & Buildx · advanced
- Declarative buildx bakeBuildKit & Buildx · advanced
- Creating a builder instanceBuildKit & Buildx · advanced
- Exporting build output to diskBuildKit & Buildx · advanced