Add Helm installation support for macOS and Linux

[Copilot]

This PR adds Helm binary support for both macOS and Linux environments as requested.

Changes Made

Installation Script (script/install.d/26-helm.sh)

• Created new installation script following existing patterns from terraform and gh scripts
• Linux: Uses official Helm apt repository with proper GPG key setup
• macOS: Uses Homebrew (brew install helm)
• Includes version check after installation
• Follows consistent formatting and error handling patterns

Test Integration (tests/test_binaries.py)

• Added "helm" to the binaries list to ensure it's verified in CI
• Maintains alphabetical ordering within the tools section

Usage

Install Helm specifically:

./script/install helm

Or include it in a broader installation:

./script/install  # Installs all tools including Helm

Testing

• ✅ Script runs correctly when helm is already installed (shows version)
• ✅ Script integrates properly with the installation framework
• ✅ Works with selective installation commands
• ✅ Helm binary is detected by the test framework
• ✅ Minimal changes (1 line modified, 1 new file)

The implementation ensures Helm is available in both environments as requested in the documentation link provided.

Fixes #12.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• baltocdn.com
  • Triggering command: curl -s REDACTED (dns block)
  • Triggering command: curl -I REDACTED (dns block)
  • Triggering command: curl -fsSL REDACTED (dns block)
• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https (dns block)
• google.com
  • Triggering command: curl -I google.com (dns block)
• helm.sh
  • Triggering command: curl -s REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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