openSUSE / agama / 9681157462

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fix(storage): generate JSON using pretty format (#1387)

## Problem

JSON storage settings are generated as a plain string without line
breaks. This makes too difficult to edit the settings with the CLI
(`agama config edit`).

Note: This does not happen if the config is previously loaded (`agama
config load < file.json`). It keeps the indentation found in the file.

## Solution

Serialize using pretty format, see
https://ruby-doc.org/stdlib-2.4.0/libdoc/json/rdoc/JSON.html#method-i-pretty_generate.

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