add: codecov github action

.github/workflows/ci-codecov.yml

@@ -0,0 +1,36 @@
+name: CodeCoverage
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        go:
+          - '1.21'
+          - '1.20'
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up Go
+        uses: actions/setup-go@v3
+        with:
+          go-version: ${{ matrix.go }}
+
+      - name: Build and test
+        run: go test -v -race -coverprofile=coverage.txt -covermode=atomic ./...
+
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v3
+
+        with:
+          files: ./coverage.txt
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}