feat: cert file and TLS skip verify

[mfiedorowicz]

This pull request adds support for custom TLS certificate files and configurable TLS verification for the Diode client, improving security and flexibility when connecting to secure endpoints. It introduces new environment variables and constructor parameters, updates documentation, and refactors certificate handling logic to allow users to specify custom certificates and control TLS verification behavior.

TLS and Certificate Handling Improvements:

• Added support for specifying a custom certificate file via the cert_file parameter in DiodeClient and the DIODE_CERT_FILE environment variable; certificates are loaded and used for secure connections. [1] [2] [3]
• Introduced the DIODE_SKIP_TLS_VERIFY environment variable and logic to control TLS verification based on the target URL scheme and environment variable, allowing users to disable verification for testing or non-production use. [1] [2]
• Refactored certificate loading and TLS verification checks to ensure correct behavior for both secure and insecure schemes, and passed loaded certificates through authentication and connection setup. [1] [2] [3] [4]

Documentation Updates:

• Updated README.md to document new environment variables (DIODE_CERT_FILE, DIODE_SKIP_TLS_VERIFY), constructor parameters, and provided usage examples for custom certificates and TLS verification settings. [1] [2]

Configuration Refactoring:

• Centralized environment variable definitions and improved configuration value retrieval for TLS and certificate-related settings.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
/opt/hostedtoolcache/Python/3.10.18/x64/lib/python3.10/site-packages/netboxlabs/diode/sdk
client.py	256	5	98%	303, 364, 369, 373, 461
TOTAL	290	5	98%

Tests	Skipped	Failures	Errors	Time
109	0 💤	0 ❌	0 🔥	1.276s ⏱️

[leoparente]

LGTM

[github-actions]

🎉 This PR is included in version 1.4.0 🎉

The release is available on GitHub release

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