/usr/share/vim/addons/ftdetect/dockerfile.vim is in vim-syntax-docker 17.12.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | au BufNewFile,BufRead [Dd]ockerfile,Dockerfile.*,*.Dockerfile set filetype=dockerfile
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