ci(pre-commit): Add "prettier" hook for YAML formatting

.github/workflows/pre-commit.yml

@@ -41,7 +41,7 @@ jobs:
       # disable these checks for now when pushing directly (but still run these
       # on Pull Requests!).
       env:
-        SKIP: end-of-file-fixer,trailing-whitespace,clang-format,eslint,no-commit-to-branch
+        SKIP: end-of-file-fixer,trailing-whitespace,clang-format,eslint,no-commit-to-branch,prettier
 
     - name: "Detect code style issues (pull_request)"
       uses: pre-commit/[email protected]

.pre-commit-config.yaml

@@ -105,6 +105,11 @@ repos:
   rev: 0.14.1
   hooks:
   - id: check-github-workflows
+- repo: https://github.com/pre-commit/mirrors-prettier
+  rev: v2.7.1
+  hooks:
+  - id: prettier
+    types: [yaml]
 - repo: local
   hooks:
   - id: qsscheck

.prettierrc.yaml

@@ -0,0 +1,2 @@
+tabWidth: 2
+singleQuote: false