Make apkbuild_lint and secfixes_check default for apkbuild filetype

autoload/ale/linter.vim

@@ -38,6 +38,7 @@ let s:default_ale_linter_aliases = {
 "
 " NOTE: Update the g:ale_linters documentation when modifying this.
 let s:default_ale_linters = {
+\   'apkbuild': ['apkbuild_lint', 'secfixes_check'],
 \   'csh': ['shell'],
 \   'elixir': ['credo', 'dialyxir', 'dogma'],
 \   'go': ['gofmt', 'golint', 'go vet'],