Make install script compatible with sh, sha256sum, and sha1sum #44
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This PR updates the install script template (install.sh.txt) to enhance compatibility across environments:
1.) Replaces hard dependency on bash with sh for broader POSIX compliance.
2.) Adds support for sha256sum and sha1sum alongside shasum, increasing compatibility with minimal environments.(e.g., Alpine Linux)
3.) Preserves behavior for existing supported systems.
4.) Regenerates install.sh using ytt; tested locally on Linux Mint.