Integrate gitlint via ale into Neovim for writing commit message

This is only done for one customer yet, as this customer has clean rules
which are already provided as community rules via gitlint.

home/programs/neovim.nix

@@ -333,6 +333,7 @@ in {
         + ''
 
           let g:ale_xml_xmllint_executable = '${pkgs.libxml2}/bin/xmllint'
+          let g:ale_gitcommit_gitlint_executable = '${pkgs.gitlint}/bin/gitlint'
         '';
     }
 

home/programs/neovim/configuration/ftdetect/folder_reuter.vim

@@ -3,6 +3,7 @@ augroup reuterFolder
     autocmd BufEnter **/emoto2/**/Unit/** execute "call ReuterSetupPhpUnitUnit()"
     autocmd BufEnter **/emoto2/**/Functional/** execute "call ReuterSetupPhpUnitFunctional()"
     autocmd BufEnter **/microservices/cms/**/*.js :setlocal tabstop=2 shiftwidth=2
+    autocmd BufEnter **/emoto2/**/.git/COMMIT_EDITMSG let b:ale_gitcommit_gitlint_options = '-c general.contrib=contrib-title-conventional-commits'
 augroup END
 
 " As long as we use older phpunit which does not provider proper testdox output