Add instructions for updating Juno node in Docker

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 72.10%. Comparing base (7a49a10) to head (c160ad0).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1736 +/- ## ========================================== + Coverage 72.07% 72.10% +0.03% ========================================== Files 90 90 Lines 9718 9718 ========================================== + Hits 7004 7007 +3 + Misses 2189 2187 -2 + Partials 525 524 -1 ```

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