[WIP] make install.sh install using curl

[Copilot]

Flux Install Script: Add curl-based installation support

Plan: Modify install.sh to use curl instead of git where possible

• Explore repository structure and understand current install.sh script
• Identify git clone operations that can be replaced with curl downloads
• Replace main repository cloning (git clone) with curl-based tar.gz download
• Add tar extraction functionality to handle downloaded archives
• Test the modified installation process
• Ensure backwards compatibility and error handling
• Verify the installation still works correctly

Current Analysis:

The current install.sh script uses git clone in two places:

1. Line 110: git clone --depth=1 https://aur.archlinux.org/yay-bin.git (AUR package - harder to replace)
2. Line 121: git clone "$REPO_URL" "$INSTALL_DIR" (main repository - can be replaced with curl)

The main improvement will be replacing the main repository cloning with a curl-based download of the GitHub archive, making the installation more efficient and not requiring git to be installed.

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