[Bug] It is not generating pdf from .md files

[LeonardoDaLuz]

Describe the bug
It is not generating pdf from .md files

To Reproduce
create .md files and try to generate pdf.

Expected behavior
Generate pdf from .md files

• OS: Windows 11
• Docfx version: [e.g. 2.77.0]

Additional context

{
  "metadata": [
    {
      "src": [
        {
          "src": "../src",
          "files": [
            "**/*.csproj"
          ]
        }
      ],
      "dest": "api"
    }
  ],
  "build": {
    "content": [
      {
        "files": [
          "**/*.{md,yml}","./docs/images/**", "images/**", "./bomber-icon.png"
        ],
        "exclude": [
          "_site/**"
        ]
      }
    ],
    "resource": [
      {
        "files": [
          "docs/images/**", "images/**", "index.html", "Demo/**", "index.css", "Videos/**"
        ]
      }
    ],
    "output": "_site",
    "template": [
      "default"
    ],
    "globalMetadata": {
      "_appName": "Bomber Kit",
      "_appTitle": "Bomber Kit",
      "_appLogoPath": "Images/bomber-icon.png",
      "_appFooter": "<style>.inheritedMembers { display: none; }</style>",
      "_enableSearch": true,
      "homepage": "index.md",
      "pdf": true
    }
  }
}

Run docfx pdf.

./doc/*.md files will be ignored.