Add gitlablint support (#3042)

doc/ale-supported-languages-and-tools.txt

@@ -665,6 +665,7 @@ Notes:
 * YAML
   * `actionlint`
   * `circleci`!!
+  * `gitlablint`
   * `prettier`
   * `spectral`
   * `swaglint`

doc/ale-yaml.txt

@@ -280,5 +280,52 @@ g:ale_yaml_yamllint_options                       *g:ale_yaml_yamllint_options*
   This variable can be set to pass additional options to yamllint.
 
 
+===============================================================================
+gitlablint                                                  *ale-yaml-gitlablint*
+
+Website: https://github.com/elijah-roberts/gitlab-lint
+
+
+Installation
+-------------------------------------------------------------------------------
+
+Install yamllint in your a virtualenv directory, locally, or globally: >
+
+  pip3 install gitlab_lint        # After activating virtualenv
+  pip3 install --user gitlab_lint # Install to ~/.local/bin
+  sudo pip3 install gitlab_lint   # Install globally
+
+See |g:ale_virtualenv_dir_names| for configuring how ALE searches for
+virtualenv directories.
+
+Is recommended to use |g:ale_pattern_options| to enable this linter so it only
+applies to 'gitlab-ci.yml' files and not all yaml files:
+>
+  let g:ale_pattern_options = {
+  \   '.gitlab-ci\.yml$': {
+  \       'ale_linters': ['gitlablint'],
+  \   },
+  \}
+<
+
+Options
+-------------------------------------------------------------------------------
+
+g:ale_yaml_gitlablint_executable               *g:ale_yaml_gitlablint_executable*
+                                               *b:ale_yaml_gitlablint_executable*
+  Type: |String|
+  Default: `'gll'`
+
+  This variable can be set to change the path to gll.
+
+
+g:ale_yaml_gitlablint_options                     *g:ale_yaml_gitlablint_options*
+                                                  *b:ale_yaml_gitlablint_options*
+  Type: |String|
+  Default: `''`
+
+  This variable can be set to pass additional options to gll.
+
+
 ===============================================================================
   vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:

doc/ale.txt

@@ -3329,6 +3329,7 @@ documented in additional help files.
     yaml-language-server..................|ale-yaml-language-server|
     yamlfix...............................|ale-yaml-yamlfix|
     yamllint..............................|ale-yaml-yamllint|
+    gitlablint............................|ale-yaml-gitlablint|
   yang....................................|ale-yang-options|
     yang-lsp..............................|ale-yang-lsp|
   zeek....................................|ale-zeek-options|