fea: add coverage actions

.github/workflows/codecov.yml

@@ -0,0 +1,29 @@
+name: Coverage CI
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Setup golang
+      uses: actions/setup-go@v3
+      with:
+        go-version: '1.16.x'
+
+    - name: Generate coverage report
+      run: make cover
+
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v3
+      with:
+        files: ./coverage.cov
+        name: codecov
+        verbose: true