Add lint check

.github/lint/.yamllint.yaml

@@ -0,0 +1,19 @@
+ignore: |
+  *.sops.*
+  gotk-components.yaml
+extends: default
+rules:
+  truthy:
+    allowed-values: ["true", "false", "on"]
+  comments:
+    min-spaces-from-content: 1
+  line-length: disable
+  braces:
+    min-spaces-inside: 0
+    max-spaces-inside: 1
+  brackets:
+    min-spaces-inside: 0
+    max-spaces-inside: 0
+  indentation:
+    spaces: 2
+    indent-sequences: consistent

.github/workflows/lint.yaml

@@ -0,0 +1,29 @@
+---
+name: Lint YAML files
+
+on:
+  pull_request:
+    paths:
+      - "**.yaml"
+      - "**.yml"
+
+jobs:
+  yamllint:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Get changes
+        uses: dorny/paths-filter@v3
+        id: filter
+        with:
+          list-files: shell
+          filters: |
+            yaml:
+              - added|modified: "**.yaml"
+              - added|modified: "**.yml"
+      - name: Lint files
+        if: ${{ steps.filter.outputs.yaml == 'true' }}
+        uses: reviewdog/action-yamllint@v1
+        with:
+          yamllint_flags: "-c .github/lint/.yamllint.yaml ${{ steps.filter.outputs.yaml_files }}"