feat: Add SOCKS5 proxy support #199
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Resolve #133.
Adds SOCKS5 proxy support (
socks5://andsocks5h://) by switching to thegit2-curlbackend forgit2, following the solution established by Cargo to work around git2's proxy limitations (See rust-lang/cargo#636).This approach replaces git2's default HTTP transport with libcurl, which properly handles SOCKS5 proxies. And also as a side effect, sheldon now respects
http_proxy,https_proxyandall_proxyenv vars. Previously, it will just ignore proxy if there's no proxy setting in .gitconfig