Add badges and a worflow for coverage

See https://github.com/marketplace/actions/go-coverage-report

Signed-off-by: Justin Kulikauskas <[email protected]>

.github/workflows/validate.yaml

@@ -37,3 +37,13 @@ jobs:
 
       - run: |
           make test
+
+      - name: Update coverage report
+        uses: ncruces/go-coverage-report@v0
+        with:
+          coverage-file: cover.out
+          report: true
+          chart: false
+          amend: false
+        if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
+        continue-on-error: true

README.md

@@ -1,11 +1,13 @@
 [comment]: # " Copyright Contributors to the Open Cluster Management project "
+[![License](https://img.shields.io/:license-apache-blue.svg)](http://www.apache.org/licenses/LICENSE-2.0.html)
+[![Go Report Card](https://goreportcard.com/badge/github.com/JustinKuli/governance-policy-nucleus)](https://goreportcard.com/report/github.com/JustinKuli/governance-policy-nucleus)
+[![Go Reference](https://pkg.go.dev/badge/image)](https://pkg.go.dev/github.com/JustinKuli/governance-policy-nucleus)
+[![Go Coverage](https://github.com/JustinKuli/governance-policy-nucleus/wiki/coverage.svg)](https://raw.githack.com/wiki/JustinKuli/governance-policy-nucleus/coverage.html)
 
 # Governance Policy Nucleus
 
 Open Cluster Management - Governance Policy Nucleus
 
-[![License](https://img.shields.io/:license-apache-blue.svg)](http://www.apache.org/licenses/LICENSE-2.0.html)
-
 ## Description
 
 The Policy Nucleus maintains common API validation, structs, and methods for policy controllers.