docs(readme): replace star-history.com with self-generated chart (#11171)

* docs(readme): replace star-history.com with self-generated chart

The star-history.com SVG is a third-party dependency that can rate
limit or go down. Replace it with a GitHub Action that fetches
stargazers via the REST API and renders an SVG with matplotlib,
committing note/star_history.svg weekly. The README references the
committed file directly, so the chart has no runtime dependency on
any external service.

* ci(star-history): run daily instead of weekly

.github/scripts/star_history.py

@@ -0,0 +1,87 @@
+#!/usr/bin/env python3
+"""Render the repository's star history to note/star_history.svg.
+
+Uses the GitHub REST stargazers endpoint with the starred-at accept header,
+which caps at 40,000 entries (400 pages of 100). The chart is regenerated on
+a schedule; if the repo grows past that cap the script stops at 40,000 and
+logs a warning rather than under-reporting.
+"""
+import json
+import os
+import sys
+import urllib.request
+from datetime import datetime
+
+import matplotlib
+
+matplotlib.use("Agg")
+import matplotlib.pyplot as plt  # noqa: E402
+from matplotlib.dates import AutoDateLocator, DateFormatter  # noqa: E402
+
+REPO = "seaweedfs/seaweedfs"
+TOKEN = os.environ["GITHUB_TOKEN"]
+OUT = os.environ.get("OUT", "note/star_history.svg")
+PAGE_CAP = 400  # GitHub's hard limit on stargazer pagination
+
+
+def fetch_stargazers():
+    stars = []
+    page = 1
+    while page <= PAGE_CAP:
+        url = f"https://api.github.com/repos/{REPO}/stargazers?per_page=100&page={page}"
+        req = urllib.request.Request(
+            url,
+            headers={
+                "Accept": "application/vnd.github.star+json",
+                "Authorization": f"Bearer {TOKEN}",
+                "X-GitHub-Api-Version": "2022-11-28",
+                "User-Agent": "seaweedfs-star-history",
+            },
+        )
+        with urllib.request.urlopen(req) as resp:
+            batch = json.load(resp)
+        if not batch:
+            break
+        for u in batch:
+            sa = u.get("starred_at")
+            if sa:
+                stars.append(datetime.fromisoformat(sa.replace("Z", "+00:00")))
+        if len(batch) < 100:
+            break
+        page += 1
+    if page > PAGE_CAP:
+        print(
+            f"::warning::Hit the {PAGE_CAP}-page stargazer pagination cap; "
+            "chart reflects the first 40,000 stars only."
+        )
+    return stars
+
+
+def render(stars, out):
+    stars.sort()
+    counts = list(range(1, len(stars) + 1))
+    fig, ax = plt.subplots(figsize=(10, 4), dpi=130)
+    ax.plot(stars, counts, color="#0969da", linewidth=1.6)
+    ax.set_xlabel("Date")
+    ax.set_ylabel("Stars")
+    ax.set_title(f"{REPO} star history")
+    ax.grid(True, linestyle="--", alpha=0.3)
+    ax.xaxis.set_major_locator(AutoDateLocator())
+    ax.xaxis.set_major_formatter(DateFormatter("%Y-%m"))
+    fig.autofmt_xdate()
+    fig.tight_layout()
+    fig.savefig(out, format="svg", transparent=False)
+    plt.close(fig)
+
+
+def main():
+    stars = fetch_stargazers()
+    if not stars:
+        print("::error::No stargazers fetched; not updating the chart.")
+        sys.exit(1)
+    render(stars, OUT)
+    print(f"Rendered {len(stars)} stars to {OUT}")
+
+
+if __name__ == "__main__":
+    main()

.github/workflows/star_history.yml

@@ -0,0 +1,46 @@
+---
+name: Star History
+
+on:
+  schedule:
+    - cron: "0 0 * * *"  # daily, 00:00 UTC
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  render:
+    name: Regenerate star history chart
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v7
+
+      - name: Set up Python
+        uses: actions/setup-python@v8
+        with:
+          python-version: "3.x"
+          cache: pip
+          cache-dependency-path: .github/scripts/star_history.py
+
+      - name: Install matplotlib
+        run: pip install matplotlib
+
+      - name: Render chart
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: python .github/scripts/star_history.py
+
+      - name: Commit if changed
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          if git diff --quiet -- note/star_history.svg; then
+            echo "No changes to the chart."
+            exit 0
+          fi
+          git add note/star_history.svg
+          git commit -m "docs: regenerate star history chart"
+          git push