ci: add weekly Maven Central download stats workflow

[javier-aliaga]

Scheduled GitHub Action (Mondays 9am UTC) that fetches OSSRH download stats (monthly timeline + per-version breakdown) and writes them to the workflow step summary. Credentials are passed via netrc file to avoid process-arg exposure, and API response data is sanitized before rendering to Markdown.

Description

Please explain the changes you've made

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #[issue number]

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[Copilot]

Pull request overview

This pull request adds a new GitHub Actions workflow file (.github/workflows/sdk-stats.yml) that implements a scheduled task to fetch and display Maven Central download statistics for the Dapr Java SDK. The workflow runs every Monday at 9 AM UTC and retrieves both monthly timeline statistics and per-version breakdown data from OSSRH (OSS Repository Hosting), displaying the results in the GitHub Actions workflow summary.

Changes:

• Added new workflow file to fetch and display Maven Central download statistics
• Implements secure credential handling via netrc file to avoid exposing tokens in process arguments
• Sanitizes API response data before rendering to Markdown to prevent injection attacks

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.54%. Comparing base (d6b25cb) to head (ee13ed8).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1707      +/-   ##
============================================
+ Coverage     79.53%   79.54%   +0.01%     
+ Complexity     2197     2196       -1     
============================================
  Files           238      238              
  Lines          6591     6591              
  Branches        732      732              
============================================
+ Hits           5242     5243       +1     
+ Misses          992      990       -2     
- Partials        357      358       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.