Fix lint issues and add fix workflow

.github/workflows/lint-fix.yml

@@ -0,0 +1,42 @@
+name: Auto-fix code quality problems
+on:
+  workflow_dispatch:
+permissions:
+  contents: write
+
+jobs:
+  lint:
+    name: Run linters
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: 18
+      - name: Get npm cache directory
+        id: npm-cache-dir
+        shell: bash
+        run: echo "dir=$(npm config get cache)" >> ${GITHUB_OUTPUT}
+      - name: Cache dependencies
+        uses: actions/cache@v5
+        with:
+          path: ${{ steps.npm-cache-dir.outputs.dir }}
+          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
+      - name: Install dependencies
+        run: npm ci
+      - name: Run ESLint
+        run: npx eslint --fix .
+      - name: Run Prettier
+        run: npx prettier --write .
+      - name: Commit changes
+        uses: EndBug/add-and-commit@v9
+        with:
+          message: Auto-fix code quality problems
+          author_name: ${{ github.actor }}
+          author_email: ${{ github.actor_id }}+${{ github.actor }}@users.noreply.github.com
+          committer_name: GitHub Actions
+          committer_email: 41898282+github-actions[bot]@users.noreply.github.com

.github/workflows/lint.yml

@@ -2,6 +2,9 @@ name: Check code quality
 on:
   push:
   pull_request:
+  workflow_dispatch:
+permissions:
+  contents: read
 
 jobs:
   lint:

src/content/rules/song-source-required.mdx

@@ -20,4 +20,4 @@ automatically_fixed: "False"
 complete_validation: "True"
 ---
 
-Song entries require a PV *or* an external link *or* an attached album entry for proof of existence. A description may be set instead if the only applicable links are direct downloads or profile-less file sharing sites.
+Song entries require a PV _or_ an external link _or_ an attached album entry for proof of existence. A description may be set instead if the only applicable links are direct downloads or profile-less file sharing sites.