The official install.sh (master branch) fails checksum verification because it
matches the .tar.gz line against the .sbom.json checksum (the tarball filename
is a prefix of the sbom filename). The downloaded tarball is NOT corrupt - its
real sha256 matches the checksums file - install.sh just picks the wrong line.
Replace install.sh with a direct tarball download + extract, reusing the
existing go_arch variable. Consistent with how Go itself is installed in this
Dockerfile (no checksum verification either).
Co-Authored-By: Claude <noreply@anthropic.com>