LSP-gh-actions

GitHub Actions workflows language server provided through @actions/languageserver.

It provides schema validation for the workflow and action files (like LSP-yaml) but also, quoting from actions/languageservice:

• value providers which can dynamically add values to the schema, for example, the list of available labels for a repository when validating runs-on.
• context providers which can dynamically provide available contexts used in expressions. For example, the contents of the github.event context for a given workflow file.

Installation

• Install LSP and LSP-gh-actions from Package Control.
• Install YamlPipelines package. It provides dedicated syntaxes for GitHub workflows that this server depends on by targeting views with source.yaml.pipeline.github-actions scope.
• Restart Sublime.

Configuration

If you have LSP-yaml installed, you don't want it running for GitHub workflows if you are using LSP-gh-actions. To achieve that, open Preferences: LSP-yaml Settings from the Command Palette and modify the selector to exclude source.yaml.pipeline.github-actions scope. For example:

@@ -61 +61 @@
-       "selector": "(source.yml | source.yaml) - (source.yaml.go | source.yaml.helm | source.yaml.esphome)",
+       "selector": "(source.yml | source.yaml) - (source.yaml.go | source.yaml.helm | source.yaml.esphome | source.yaml.pipeline.github-actions)",

Open configuration file using command palette with Preferences: LSP-gh-actions Settings command or opening it from the Sublime menu (Preferences > Package Settings > LSP > Servers > LSP-gh-actions).