enable code coverage (IceWhaleTech#825)

.github/workflows/codecov.yml

@@ -0,0 +1,22 @@
+name: Collect Code Coverage
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Run coverage
+        run: go test -race -failfast -coverprofile=coverage.txt -covermode=atomic -v ./...
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v3

README.md

@@ -28,6 +28,9 @@
     <a href="https://github.com/IceWhaleTech/CasaOS/issues" target="_blank">
         <img alt="CasaOS Issues" src="https://img.shields.io/github/issues/IceWhaleTech/CasaOS?color=162453&style=flat-square&label=Issues" />
     </a>
+    <a href="https://codecov.io/gh/IceWhaleTech/CasaOS" > 
+    <img src="https://codecov.io/gh/IceWhaleTech/CasaOS/branch/main/graph/badge.svg?token=l9uMKGlkxM"/> 
+    </a>
     <a href="https://github.com/IceWhaleTech/CasaOS/stargazers" target="_blank">
         <img alt="CasaOS Stargazers" src="https://img.shields.io/github/stars/IceWhaleTech/CasaOS?color=162453&style=flat-square&label=Stars" />
     </a>