CI: lint workflow YAML

.editorconfig

@@ -13,3 +13,8 @@ indent_style = space
 indent_style = space
 indent_size = 2
 trim_trailing_whitespace = true
+
+[*.{yml,yaml}]
+indent_size = 2
+indent_style = space
+trim_trailing_whitespace = true

.github/workflows/check-changelog.yml

@@ -4,22 +4,24 @@ on:
   pull_request:
     types:
       # On by default if you specify no types.
-      - "opened"
-      - "reopened"
-      - "synchronize"
+      - opened
+      - reopened
+      - synchronize
       # For `skip-label` only.
-      - "labeled"
-      - "unlabeled"
+      - labeled
+      - unlabeled
 
 jobs:
   check-changelog:
     runs-on: ubuntu-latest
     steps:
-      - name: "Check for changelog entry"
+      - name: Check for changelog entry
         uses: brettcannon/check-for-changed-files@v1
         with:
           file-pattern: |
             .changes/unreleased/*.yaml
             CHANGELOG.md
-          skip-label: "skip changelog"
-          failure-message: "Missing a changelog file in ${file-pattern}; please add one or apply the ${skip-label} label to the pull request"
+          skip-label: skip changelog
+          failure-message: >-
+            Missing a changelog file in ${file-pattern}; please add one or apply
+            the ${skip-label} label to the pull request