Add DORA Metrics Badges and Metrics Workflow Automation

[yunks128]

Purpose

• Introduce DORA (DevOps Research and Assessment) metrics to enhance visibility into engineering performance.
• Add machine-readable badge data for integration with Shields.io.
• Automate badge updates via GitHub Actions for real-time reflection of repository health.

Proposed Changes

• [ADD] .github/badges/ JSON files for:
  • Deployment Frequency
  • Change Failure Rate
  • Lead Time for Changes
  • Mean Time to Recovery (MTTR)
  • Composite DORA metrics
• [ADD] .github/workflows/metrics.yml for automating DORA badge generation
• [CHANGE] README.md to display consolidated DORA badge

Issue

This is related to: NASA-AMMOS/slim#189

Testing

• Validated all badge endpoints locally via raw GitHub file URL
• Triggered GitHub Actions to confirm successful badge file updates
• Verified new badges rendering correctly in README.md

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud