docs: enrich the readme badges (#117)

.github/workflows/ci.yaml

@@ -39,12 +39,13 @@ jobs:
       run: |
         make test
         git status
-    # TODO: enable after public
-    #    - name: Publish Unit Test Coverage
-    #      uses: codecov/codecov-action@v3
-    #      with:
-    #        flags: unittests
-    #        file: cover.out
+    - name: Upload coverage reports to Codecov
+      uses: codecov/codecov-action@v3.1.4
+      with:
+        flags: unittests
+        file: cover.out
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
     - name: Check diff
       run: '[[ -z $(git status -s) ]] || (printf "Existing modified/untracked files.\nPlease run \"make generate manifests fmt vet\" and push again.\n"; exit 1)'
 

README.md

@@ -1,5 +1,11 @@
 # Operating
 
+[![license](https://img.shields.io/github/license/KusionStack/operating.svg)](https://github.com/KusionStack/operating/blob/main/LICENSE)
+[![Operating](https://github.com/KusionStack/operating/actions/workflows/release.yaml/badge.svg)](https://github.com/KusionStack/operating/actions/workflows/release.yaml)
+[![GitHub release](https://img.shields.io/github/release/KusionStack/operating.svg)](https://github.com/KusionStack/operating/releases)
+[![Go Report Card](https://goreportcard.com/badge/github.com/KusionStack/operating)](https://goreportcard.com/report/github.com/KusionStack/operating)
+[![codecov](https://codecov.io/gh/KusionStack/operating/branch/master/graph/badge.svg)](https://codecov.io/gh/KusionStack/operating)
+
 KusionStack Operating ([official site](https://kusionstack.io/docs/operating/introduction/)) provides a set of workloads and operators
 built on Kubernetes Custom Resource Definitions (CRDs), with a primary aim of bridging the gap 
 between platform development and Kubernetes.