add yamllint pre-commit hook (#1168)

.codecov.yml

@@ -1,11 +1,12 @@
+---
 codecov:
   branch: master
 
 coverage:
   range: "95..100"
 
   status:
-    project: no
+    project: false
 
 flags:
   library:

.github/FUNDING.yml

@@ -1,12 +1,15 @@
+---
 # These are supported funding model platforms
 
-github: [thehesiod, terrycain] # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
-patreon: # Replace with a single Patreon username
-open_collective: # Replace with a single Open Collective username
-ko_fi: # Replace with a single Ko-fi username
-tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
-community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
-liberapay: # Replace with a single Liberapay username
-issuehunt: # Replace with a single IssueHunt username
-otechie: # Replace with a single Otechie username
-custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']
+github:
+- thehesiod
+- terrycain
+patreon:
+open_collective:
+ko_fi:
+tidelift:
+community_bridge:
+liberapay:
+issuehunt:
+otechie:
+custom:

.github/dependabot.yml

@@ -1,16 +1,17 @@
+---
 # To get started with Dependabot version updates, you'll need to specify which
 # package ecosystems to update and where the package manifests are located.
 # Please see the documentation for all configuration options:
 # https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
 
 version: 2
 updates:
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: "daily"
+- package-ecosystem: "github-actions"
+  directory: "/"
+  schedule:
+    interval: "daily"
 
-  - package-ecosystem: "pip"
-    directory: "/"
-    schedule:
-      interval: "daily"
+- package-ecosystem: "pip"
+  directory: "/"
+  schedule:
+    interval: "daily"

.github/workflows/pre-commit.yml

@@ -1,3 +1,4 @@
+---
 name: "Pre-commit"
 
 on:

.github/workflows/stale.yml

@@ -1,4 +1,6 @@
-# This workflow warns and then closes issues and PRs that have had no activity for a specified amount of time.
+---
+# This workflow warns and then closes issues and PRs that have had no activity
+# for a specified amount of time.
 #
 # You can adjust the behavior by modifying this file.
 # For more information, see:
@@ -7,7 +9,7 @@ name: Mark stale issues and pull requests
 
 on:
   schedule:
-    - cron: '31 21 * * *'
+  - cron: '31 21 * * *'
   workflow_dispatch:
 
 jobs:
@@ -19,8 +21,14 @@ jobs:
       pull-requests: write
 
     steps:
-      - uses: actions/stale@v5
-        with:
-          stale-issue-message: 'This issue has been marked as stale because it has been inactive for more than 60 days. Please update this pull request or it will be automatically closed in 7 days.'
-          stale-pr-message: 'This pull request has been marked as stale because it has been inactive for more than 60 days. Please update this pull request or it will be automatically closed in 7 days.'
-          operations-per-run: '60'
+    - uses: actions/stale@v5
+      with:
+        stale-issue-message: >-
+          This issue has been marked as stale because it has been inactive for
+          more than 60 days. Please update this pull request or it will be
+          automatically closed in 7 days.
+        stale-pr-message: >-
+          This pull request has been marked as stale because it has been
+          inactive for more than 60 days. Please update this pull request or
+          it will be automatically closed in 7 days.
+        operations-per-run: '60'

.pre-commit-config.yaml

@@ -1,17 +1,23 @@
+---
 repos:
-  - repo: 'https://github.com/pre-commit/pre-commit-hooks'
-    rev: v4.5.0
-    hooks:
-      - id: check-yaml
-      - id: end-of-file-fixer
-      - id: trailing-whitespace
-  - repo: 'https://github.com/PyCQA/isort'
-    rev: 5.12.0
-    hooks:
-      - id: isort
-  - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.4.8
-    hooks:
-      - id: ruff
-        args: [ --fix ]
-      - id: ruff-format
+- repo: 'https://github.com/pre-commit/pre-commit-hooks'
+  rev: v4.5.0
+  hooks:
+  - id: check-yaml
+  - id: end-of-file-fixer
+  - id: trailing-whitespace
+- repo: 'https://github.com/PyCQA/isort'
+  rev: 5.12.0
+  hooks:
+  - id: isort
+- repo: https://github.com/astral-sh/ruff-pre-commit
+  rev: v0.4.8
+  hooks:
+  - id: ruff
+    args: [--fix]
+  - id: ruff-format
+- repo: https://github.com/adrienverge/yamllint.git
+  rev: v1.35.1
+  hooks:
+  - id: yamllint
+    args: [--strict]

.readthedocs.yml

@@ -1,3 +1,4 @@
+---
 version: 2
 
 build:
@@ -10,9 +11,9 @@ sphinx:
 
 python:
   install:
-    - path: .
-    - requirements: docs/requirements.txt
+  - path: .
+  - requirements: docs/requirements.txt
 
 formats:
-  - htmlzip
-  - epub
+- htmlzip
+- epub

.yamllint

@@ -0,0 +1,15 @@
+---
+extends: default
+
+rules:
+  indentation:
+    level: error
+    indent-sequences: false
+  truthy:
+    allowed-values:
+    - >-
+      false
+    - >-
+      true
+    - >-  # Allow "on" key name in GHA CI/CD workflow definitions
+      on