feat: configure codecov with 80% coverage requirement

- Add codecov.yml configuration file with 80% target coverage
- Update GitHub Actions CI to use XML coverage format for better Codecov integration
- Set project and patch coverage targets to 80% with 1% threshold
- Current coverage is 89%, well above the 80% requirement

This ensures code quality standards are maintained with proper coverage reporting.

Author: shibbirmcc

.github/workflows/ci.yml

@@ -61,7 +61,7 @@ jobs:
       uses: codecov/codecov-action@v5
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
-        files: ./coverage.txt
+        files: ./coverage.xml
         flags: unittests
         name: codecov-umbrella
         fail_ci_if_error: true

codecov.yml

@@ -0,0 +1,15 @@
+coverage:
+  status:
+    project:
+      default:
+        target: 80%
+        threshold: 1%
+    patch:
+      default:
+        target: 80%
+        threshold: 1%
+
+comment:
+  layout: "reach,diff,flags,tree"
+  behavior: default
+  require_changes: false