vim-patch:244198f: runtime(autopkgtest): add ftplugin file for autopkgtest

closes: vim/vim#17679

https://github.com/vim/vim/commit/244198f0396fe1d744a3accdb78af7948c8f5cbb

Co-authored-by: James McCoy <jamessan@jamessan.com>

runtime/ftplugin/autopkgtest.vim

@@ -0,0 +1,17 @@
+" Vim filetype plugin file
+" Language:     Debian autopkgtest control files
+" Maintainer:   Debian Vim Maintainers
+" Last Change:  2025 Jul 05
+" URL:          https://salsa.debian.org/vim-team/vim-debian/blob/main/ftplugin/autopkgtest.vim
+
+" Do these settings once per buffer
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin=1
+
+setlocal comments=:#
+setlocal commentstring=#\ %s
+
+" Clean unloading
+let b:undo_ftplugin = 'setlocal comments< commentstring<'