(helm)Fix: protocol for container port

[gmemstr]

This can trip up strict spec validators like https://kubenix.org/

Description 📣

Ensures the Helm chart adheres strictly to the Kubernetes pod schema.

Type ✨

• [x] Bug fix
• [ ] New feature
• [ ] Breaking change
• [ ] Documentation

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• [x] I have read the contributing guide, agreed and acknowledged the code of conduct. 📝

[gmemstr]

Worth noting that the secrets operator already has this.