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What
Remove the unused rpc_repo_to_horizon_repo.sh script, and remove line from the Makefile that tried to use a script to figure out a branch.
Why
Most uses of the image use specifically defined versions. It's very rare we build the image with just random versions of different services, as evidenced by the fact the reference to the script was broken and nobody noticed.
This image is already very complex, and having scripts perform version selection of tools when building is one more layer of complexity we don't really need in this repo.