build: Fail `helm upgrade` if secrets are not set in `values.yaml`

[MoritzWeber0]

To avoid unintential default secrets in production, passwords default to null now. helm upgrade will fail if the secrets are not set.

[github-actions[bot]]

This report was generated by comparing c6e0058 with d15f1e3. If you would like to check difference, please check here.

ArtifactName: reg

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item	count
pass	262
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delete	0

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 44.44444% with 10 lines in your changes missing coverage. Please review.

Project coverage is 84.04%. Comparing base (6828e3a) to head (4e8a758). Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
backend/capellacollab/core/logging/loki.py	12.50%	7 Missing :warning:
backend/capellacollab/config/models.py	77.77%	1 Missing and 1 partial :warning:
backend/capellacollab/sessions/operators/k8s.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1818 +/- ## ========================================== - Coverage 84.13% 84.04% -0.09% ========================================== Files 194 194 Lines 6441 6468 +27 Branches 708 715 +7 ========================================== + Hits 5419 5436 +17 - Misses 867 876 +9 - Partials 155 156 +1 ```

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[github-actions[bot]]

This report was generated by comparing 0f7fee1 with 6828e3a. If you would like to check difference, please check here.

ArtifactName: reg

✨✨ That's perfect, there is no visual difference! ✨✨

item	count
pass	262
change	0
new	0
delete	0

[github-actions[bot]]

This report was generated by comparing f50619d with 6828e3a. If you would like to check difference, please check here.

ArtifactName: reg

✨✨ That's perfect, there is no visual difference! ✨✨

item	count
pass	262
change	0
new	0
delete	0

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions[bot]]

This report was generated by comparing 9efebeb with 6828e3a. If you would like to check difference, please check here.

ArtifactName: reg

✨✨ That's perfect, there is no visual difference! ✨✨

item	count
pass	262
change	0
new	0
delete	0