ci: add Codecov integration for code coverage reporting

.codecov.yml

@@ -0,0 +1,30 @@
+codecov:
+  require_ci_to_pass: yes
+
+coverage:
+  precision: 2
+  round: down
+  range: "70...100"
+  status:
+    project:
+      default:
+        target: auto
+        threshold: 1%
+        informational: false
+    patch:
+      default:
+        target: auto
+        threshold: 1%
+        informational: false
+
+comment:
+  layout: "reach,diff,flags,tree"
+  behavior: default
+  require_changes: no
+  require_base: no
+  require_head: yes
+
+ignore:
+  - "**/*_test.go"
+  - "**/examples/**"
+  - "**/testdata/**"

.github/workflows/go.yml

@@ -67,3 +67,13 @@ jobs:
 
       - name: Run Tests
         run: make test
+
+      - name: Upload coverage to Codecov
+        if: matrix.os == 'ubuntu-latest'
+        uses: codecov/codecov-action@v5
+        with:
+          file: ./coverage.txt
+          flags: unittests
+          name: codecov-umbrella
+          fail_ci_if_error: false
+          token: ${{ secrets.CODECOV_TOKEN }}