ci: validate published workflow templates

.github/actionlint.yaml

@@ -0,0 +1,9 @@
+paths:
+  # Accepted style advisories in existing templates.
+  "{compile,deploy,start-preview,close-preview,refresh,lightdash-validate}.yml":
+    ignore:
+      - "shellcheck reported issue"
+  # Genuine validity error tracked in PROD-10126; remove when that ticket is fixed.
+  close-preview.yml:
+    ignore:
+      - "invalid activity type \"merged\""

.github/workflows/lint-templates.yml

@@ -0,0 +1,17 @@
+name: Lint workflow templates
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  actionlint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - name: Lint root-level workflow templates
+        uses: docker://rhysd/actionlint:1.7.12
+        with:
+          args: compile.yml deploy.yml start-preview.yml close-preview.yml refresh.yml lightdash-validate.yml

renovate.json

@@ -0,0 +1,9 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["config:recommended"],
+  "github-actions": {
+    "managerFilePatterns": [
+      "/^(?:compile|deploy|start-preview|close-preview|refresh|lightdash-validate)\\.yml$/"
+    ]
+  }
+}