feat: MLOPS-288 - use kaniko to improve wanna-ml cloud builds

[jsilva]

Describe your changes

Update cloud build step to use the recommended kaniko flow that leverages cached layer in the registry

Issue ticket number and link

MLOPS-288

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] If it is a core feature, I have added thorough tests.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (8b9d240) 74.16% compared to head (c793d49) 74.16%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #84 +/- ## ======================================= Coverage 74.16% 74.16% ======================================= Files 57 57 Lines 2795 2795 ======================================= Hits 2073 2073 Misses 722 722 ``` | [Impacted Files](https://codecov.io/gh/avast/wanna-ml/pull/84?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=avast) | Coverage Δ | | |---|---|---| | [src/wanna/core/services/docker.py](https://codecov.io/gh/avast/wanna-ml/pull/84?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=avast#diff-c3JjL3dhbm5hL2NvcmUvc2VydmljZXMvZG9ja2VyLnB5) | `64.76% <0.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=avast). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=avast)

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