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Add a note about caching and docker to the readme #1233

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Add a note about caching and docker to the readme #1233

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11 changes: 11 additions & 0 deletions README.md
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Expand Up @@ -45,6 +45,17 @@ require:
Now you can run `rubocop` and it will automatically load the RuboCop Rails
cops together with the standard cops.

#### Usage with Docker

When you use Docker make sure that the RuboCop [cache path](https://docs.rubocop.org/rubocop/usage/caching.html#cache-path) is mounted as a volume in order to reliably persist the cache.

If developing a Rails application there already exists a temporary directory you should be persisting anyways: `tmp` in the application root folder. You can point the RuboCop cache there:

```yml
AllCops:
CacheRootDirectory: tmp/cache
```

### Command line

```sh
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