Add coverage push in github post action.

Signed-off-by: xuezhaojun <[email protected]>

.github/workflows/go-postsubmit.yml

@@ -13,6 +13,27 @@ env:
   GO_REQUIRED_MIN_VERSION: ''
 
 jobs:
+  coverage:
+    name: coverage
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout code
+        uses: actions/checkout@v4
+      - name: install Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+      - name: unit
+        run: make test
+      - name: report coverage
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_UPLOAD_TOKEN }}
+          files: ./coverage.out
+          flags: unit
+          name: unit
+          verbose: true
+          fail_ci_if_error: true
   images:
     name: images
     runs-on: ubuntu-latest