updated caching docs [CI SKIP]
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DOCS.md
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DOCS.md
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Note that in the above example we quote the version numbers. If the yaml parser interprets the value as a number it will cause a parsing error.
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You may want to cache Docker image layers between builds to speed up the build process:
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## Layer Caching
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The Drone build environment is, by default, ephemeral meaning that you layers are not saved between builds. The below example combines Drone's caching feature and Docker's `save` and `load` capabilities to cache and restore image layers between builds:
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```
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publish:
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@ -79,6 +81,8 @@ cache:
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- docker/image.tar
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```
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In some cases caching will greatly improve build performance, however, the tradeoff is that caching Docker image layers may consume very large amounts of disk space.
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## Troubleshooting
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For detailed output you can set the `DOCKER_LAUNCH_DEBUG` environment variable in your plugin configuration. This starts Docker with verbose logging enabled.
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