Adding helm build as part of `prepare-release` target

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Codecov Report

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

Project coverage is 61.78%. Comparing base (be0621c) to head (97c8f9e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #189 +/- ## ========================================== - Coverage 62.54% 61.78% -0.77% ========================================== Files 2 2 Lines 785 785 ========================================== - Hits 491 485 -6 - Misses 244 249 +5 - Partials 50 51 +1 ``` | [Flag](https://app.codecov.io/gh/Kuadrant/authorino-operator/pull/189/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kuadrant) | Coverage Δ | | |---|---|---| | [unit](https://app.codecov.io/gh/Kuadrant/authorino-operator/pull/189/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kuadrant) | `61.78% <ø> (-0.77%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kuadrant#carryforward-flags-in-the-pull-request-comment) to find out more.

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