Add optional TLS setup to Valkey installer

[pshankinclarke]

✍️ Description

Automatic configuration of TLS gives users an easy option to encrypt Valkey traffic and protect the generated password without need to manually edit valkey.conf or reason about TLS details for each LXC instance.

I tested 3 cases (TLS disabled, TLS+TCP, TLS-only), checking valkey.conf, the listening ports, and valkey-cli with ping.

🔗 Related Issue

Fixes #

✅ Prerequisites (X in brackets)

• Self-review completed – Code follows project standards.
• Tested thoroughly – Changes work as expected.
• No security risks – No hardcoded secrets, unnecessary privilege escalations, or permission issues.

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🛠️ Type of Change (X in brackets)

• 🐞 Bug fix – Resolves an issue without breaking functionality.
• ✨ New feature – Adds new, non-breaking functionality.
• 💥 Breaking change – Alters existing functionality in a way that may require updates.
• 🆕 New script – A fully functional and tested script or script set.
• 🌍 Website update – Changes to website-related JSON files or metadata.
• 🔧 Refactoring / Code Cleanup – Improves readability or maintainability without changing functionality.
• 📝 Documentation update – Changes to README, AppName.md, CONTRIBUTING.md, or other docs.

[CrazyWolf13]

We have a func for this:

https://github.com/community-scripts/ProxmoxVE/blob/main/misc/tools.func#L1542