feat: Add GitHub Stats Card Action

[luojiyin1987]

Summary

Add a reusable GitHub Action that generates stats cards as static SVG files and commits them to the repository. This provides a self-hosting alternative to Vercel, addressing the rate limiting issues discussed in #4748.

Features

• 📊 Three card types: stats, repo-pins, and top-languages
• 🚀 No external services - Uses GitHub's own file distribution
• 🔄 Automatic updates - Runs on schedule or manually
• 🎨 Fully customizable - All themes and options supported

Card Types

Type	Description
stats	GitHub stats card (stars, commits, PRs, etc.)
langs	Top languages card with multiple layouts
repo	Repository pin card

Usage Example

name: Update Stats Card
on:
  schedule:
    - cron: '0 */6 * * *'
  workflow_dispatch:
permissions:
  contents: write
jobs:
  update:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: anuraghazra/github-readme-stats/.github/actions/github-stats-card@master
        with:
          username: ${{ github.repository_owner }}
          card_type: stats
          token: ${{ secrets.GITHUB_TOKEN }}

Then in README:

\![Stats](./github-stats/stats.svg)

Files Added

• .github/actions/github-stats-card/ - Reusable action source
• .github/workflows/example-stats-card-action.yml - Example workflow

Related

Closes #4748

[vercel]

@luojiyin1987 is attempting to deploy a commit to the github readme stats Team on Vercel.

A member of the Team first needs to authorize it.