ci: add yamllint (#6682)

adds yaml linting to CI and applies rules to existing yaml files.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6682-ci-add-yamllint-2aa6d73d365081b4b67ae9d9cc86760f)
by [Unito](https://www.unito.io)

.github/workflows/ci-python-validation.yaml

@@ -6,7 +6,7 @@ on:
     paths:
       - 'tools/devtools/**'
   push:
-    branches: [ main ]
+    branches: [main]
     paths:
       - 'tools/devtools/**'
 

.github/workflows/ci-yaml-validation.yaml

@@ -0,0 +1,33 @@
+name: "CI: YAML Validation"
+description: "Validates YAML syntax and style using yamllint with relaxed rules"
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '**/*.yml'
+      - '**/*.yaml'
+  pull_request:
+    paths:
+      - '**/*.yml'
+      - '**/*.yaml'
+
+jobs:
+  yaml-lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.x'
+
+      - name: Install yamllint
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install yamllint
+
+      - name: Validate YAML syntax and style
+        run: ./scripts/cicd/check-yaml.sh

.github/workflows/i18n-update-core.yaml

@@ -6,7 +6,7 @@ on:
   workflow_dispatch:
   # Only trigger on PRs to main/master - additional branch filtering in job condition
   pull_request:
-    branches: [ main ]
+    branches: [main]
     types: [opened, synchronize, reopened]
 
 jobs:

.github/workflows/version-bump-desktop-ui.yaml

@@ -92,4 +92,3 @@ jobs:
           base: ${{ github.event.inputs.branch }}
           labels: |
             Release
-

.yamllint

@@ -0,0 +1,10 @@
+extends: default
+
+ignore: |
+  node_modules/
+  dist/
+
+rules:
+  line-length: disable
+  document-start: disable
+  truthy: disable

scripts/cicd/check-yaml.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(git rev-parse --show-toplevel)"
+cd "$ROOT_DIR"
+
+mapfile -t yaml_files < <(git ls-files '*.yml' '*.yaml')
+
+if [[ ${#yaml_files[@]} -eq 0 ]]; then
+  echo "No YAML files found to lint"
+  exit 0
+fi
+
+yamllint --config-file .yamllint "${yaml_files[@]}"