Add CI/CD pipeline documentation

docs/environments.md

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+# Staging vs Production
+
+## Staging Environment
+
+Purpose:
+- Testing before release.
+- Validate new features.
+- Detect bugs.
+- Verify Docker images.
+- Run integration tests.
+
+Characteristics:
+- Mirrors production.
+- Uses test data.
+- Safe for experimentation.
+- Developers and QA have access.
+
+---
+
+## Production Environment
+
+Purpose:
+- Serve real users.
+- Provide stable services.
+- High availability.
+- Performance optimized.
+
+Characteristics:
+- Uses real data.
+- Restricted access.
+- Monitored continuously.
+- Requires approval before deployment.