add codecov workflow

.github/workflows/coverage.yml

@@ -0,0 +1,35 @@
+name: test-coverage
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+
+permissions:
+  contents: read
+
+
+jobs:
+  lint:
+    name: Lint and Format
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "stable"
+
+      - name: Run coverage
+        run: go test -coverprofile=coverage.out -coverpkg=./... ./...
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+