Refactor docker download logic to use common_download_file_single with is_docker parameter#22

Copilot wants to merge 6 commits intodocker-pull-functionalityericcurtin/llama.cpp:docker-pull-functionalityfrom

copilot/refactor-docker-download-logicericcurtin/llama.cpp:copilot/refactor-docker-download-logicCopy head branch name to clipboard