Add version check and update subcommands for CLI self-update #111
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Adds `apppack version check` to check for available updates and `apppack version update` to download and install the latest release from GitHub. Features: - Cross-platform support (Linux, macOS Intel/ARM, Windows) - SHA256 checksum verification before binary replacement - Blocks Homebrew installs with helpful upgrade message - Safe binary replacement with atomic rename and fallbacks - --force flag to update even when already on latest version
Use io.CopyN with a 100MB limit instead of io.Copy when extracting binaries from archives to prevent decompression bomb attacks. Addresses GO-S2110 (CWE-409)
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Summary
apppack version checkto check for available updatesapppack version updateto download and install the latest release from GitHub--forceflag to update even when already on latest versionFeatures
brew upgrade apppackmessageTest plan
apppack versionstill shows current versionapppack version checkreports if update is availableapppack version updatedownloads and installs latest releaseapppack version update --forceupdates even if current