Lint YAML.

.github/workflows/autofix.yaml

@@ -1,5 +1,6 @@
+---
 name: Autofix
-on:
+"on":
   push:
     # Only targets default branch to avoid amplification effects of
     # auto-fixing the exact same stuff in multiple non-rebased branches.
@@ -27,9 +28,11 @@ jobs:
           # https://github.com/thlorenz/doctoc/pull/145
           doctoc --github --title "## Contents" readme.md
       - name: Remove forbidden special TOC entries
-        # See: https://github.com/sindresorhus/awesome-lint/blob/v0.16.0/rules/toc.js#L15-L18
-        run: |
-          gawk -i inplace '!/^- \[(Contributing|Footnotes)\]\(#.+\)$/{print}' ./readme.md
+        # See: https://github.com/sindresorhus/awesome-lint/blob/v0.16.0/rules
+        # /toc.js#L15-L18
+        run: >
+          gawk -i inplace '!/^- \[(Contributing|Footnotes)\]\(#.+\)$/{print}'
+          ./readme.md
       - name: Commit and push changes
         uses: stefanzweifel/git-auto-commit-action@v4.7.1
         with:

.github/workflows/autolock.yaml

@@ -1,5 +1,6 @@
 # Locks closed issues and pull requests after a period of inactivity, to
 # prevent spam and noise.
+---
 name: Autolock
 "on":
   schedule:

.github/workflows/labels_sync.yaml

@@ -1,5 +1,6 @@
+---
 name: Sync labels
-on: issues
+"on": issues
 
 jobs:
 
@@ -7,7 +8,7 @@ jobs:
     name: Sync labels
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2.3.3
-    - uses: lannonbr/issue-label-manager-action@2.0.0
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - uses: actions/checkout@v2.3.3
+      - uses: lannonbr/issue-label-manager-action@2.0.0
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/lint.yaml

@@ -1,5 +1,6 @@
+---
 name: Lint
-on:
+"on":
   push:
   pull_request:
   schedule:
@@ -12,11 +13,11 @@ jobs:
     name: Lint markdown
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2.3.3
-    - uses: avto-dev/markdown-lint@v1.4.0
-      with:
-        config: '.github/markdown-lint.yaml'
-        args: './**/*.md'
+      - uses: actions/checkout@v2.3.3
+      - uses: avto-dev/markdown-lint@v1.4.0
+        with:
+          config: '.github/markdown-lint.yaml'
+          args: './**/*.md'
 
   lint-awesome:
     name: Lint Awesome list