feat(badges): GHCR total downloads badge fed by a scheduled scraper

GitHub shows the container package's total downloads on its public page
but exposes no API for it, so a daily workflow scrapes the count and
force-pushes a shields.io endpoint JSON to the orphan badges branch.
The README renders it next to the release downloads badge.

Author: mateof

.github/workflows/ghcr-downloads-badge.yml

@@ -0,0 +1,46 @@
+name: GHCR downloads badge
+
+# GitHub shows the total download count on the public package page but does
+# not expose it through any API, so this scheduled job scrapes the page and
+# publishes a shields.io endpoint JSON to the orphan `badges` branch. The
+# README renders it with:
+#   https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/mateof/TelegramFileManager/badges/ghcr-downloads.json
+
+on:
+  schedule:
+    - cron: '17 3 * * *'
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  badge:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Scrape total downloads from the package page
+        id: scrape
+        run: |
+          COUNT=$(curl -sL "https://github.com/mateof/TelegramFileManager/pkgs/container/telegramfilemanager" \
+            | perl -0777 -ne 'print $1 if /Total downloads.*?title="([\d,\.]+)"/s')
+          if [ -z "$COUNT" ]; then
+            echo "Could not scrape the download count (page layout changed?)"
+            exit 1
+          fi
+          echo "Scraped count: $COUNT"
+          echo "count=$COUNT" >> "$GITHUB_OUTPUT"
+
+      - name: Publish endpoint JSON to the badges branch
+        run: |
+          mkdir out && cd out
+          cat > ghcr-downloads.json <<EOF
+          {"schemaVersion": 1, "label": "ghcr downloads", "message": "${{ steps.scrape.outputs.count }}", "color": "2496ED", "namedLogo": "docker"}
+          EOF
+          git init -b badges
+          git add ghcr-downloads.json
+          git -c user.name=github-actions[bot] \
+              -c user.email=41898282+github-actions[bot]@users.noreply.github.com \
+              commit -m "update GHCR downloads badge data"
+          git push --force \
+            "https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/${{ github.repository }}.git" \
+            badges

README.md

@@ -6,6 +6,7 @@
   <a href="https://github.com/mateof/TelegramFileManager/pkgs/container/telegramfilemanager"><img alt="GHCR image" src="https://img.shields.io/badge/ghcr.io-image-2496ED?logo=docker&amp;logoColor=white"></a>
   <a href="https://dotnet.microsoft.com/"><img alt=".NET" src="https://img.shields.io/badge/.NET-Blazor%20Server-512BD4?logo=dotnet&amp;logoColor=white"></a>
   <a href="https://github.com/mateof/TelegramFileManager/releases"><img alt="Downloads" src="https://img.shields.io/github/downloads/mateof/TelegramFileManager/total?label=downloads&amp;color=success"></a>
+  <a href="https://github.com/mateof/TelegramFileManager/pkgs/container/telegramfilemanager"><img alt="GHCR downloads" src="https://img.shields.io/endpoint?url=https%3A%2F%2Fraw.githubusercontent.com%2Fmateof%2FTelegramFileManager%2Fbadges%2Fghcr-downloads.json"></a>
   <a href="https://github.com/mateof/TelegramFileManager/stargazers"><img alt="Stars" src="https://img.shields.io/github/stars/mateof/TelegramFileManager?style=flat&amp;logo=github&amp;color=yellow"></a>
   <a href="LICENSE"><img alt="License" src="https://img.shields.io/github/license/mateof/TelegramFileManager"></a>
   <a href="https://github.com/mateof/TelegramFileManager/commits/main"><img alt="Last commit" src="https://img.shields.io/github/last-commit/mateof/TelegramFileManager"></a>