feat: propagate proxy settings to trivy server

[sylvainOL]

Description

Related issues

• Close Trivy server doesn't honour http(s) proxy configuration given in helm chart #1145

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Checklist

• I've read the guidelines for contributing to this repository.
• I've added tests that prove my fix is effective or that my feature works. --> N/A
• I've updated the documentation with the relevant information (if needed). --> N/A
• I've added usage information (if the PR introduces new options) --> N/A
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[chen-keinan]

@sylvainOL thank you for the contribution lgtm 🚀