Add codecov to CI (#3382)

* Add `codecov` to CI

Signed-off-by: Abhinav Sinha <abhinav@nirmata.com>

* Add `codecov` badge for `main` to `README.md`

Signed-off-by: Abhinav Sinha <abhinav@nirmata.com>

* Addressed code review

Signed-off-by: Abhinav Sinha <abhinav@nirmata.com>

.github/workflows/codecov.yaml

@@ -0,0 +1,35 @@
+name: Codecov
+
+on:
+  push:
+    branches:
+      - 'main'
+      - 'release*'
+  pull_request:
+    branches:
+      - 'main'
+      - 'release*'
+
+permissions: read-all
+
+jobs:
+  codecov:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    steps:
+      - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 # v2.4.0
+      - uses: actions/setup-go@424fc82d43fa5a37540bae62709ddcc23d9520d4 # v2.1.5
+        with:
+          go-version: '1.17'
+      -
+        name: Generate Code Coverage Report
+        run: make code-cov-report
+      -
+        name: Upload Report to Codecov
+        uses: codecov/codecov-action@f32b3a3741e1053eb607407145bc9619351dc93b # v2.1.0
+        with:
+          file: ./coverage.out
+          fail_ci_if_error: true
+          verbose: true

Makefile

@@ -265,11 +265,13 @@ test-unit: $(GO_ACC)
 	@echo "	running unit tests"
 	go-acc ./... -o $(CODE_COVERAGE_FILE_TXT)
 
-code-cov-report: $(CODE_COVERAGE_FILE_TXT)
+code-cov-report:
-# transform to html format
+# generate code coverage report
 	@echo "	generating code coverage report"
-	go tool cover -html=coverage.txt
+
-	if [ -a $(CODE_COVERAGE_FILE_HTML) ]; then open $(CODE_COVERAGE_FILE_HTML); fi;
+	GO111MODULE=on go test -v -coverprofile=coverage.out ./...
+	go tool cover -func=coverage.out -o $(CODE_COVERAGE_FILE_TXT)
+	go tool cover -html=coverage.out -o $(CODE_COVERAGE_FILE_HTML)
 
 # Test E2E
 test-e2e:

README.md

@@ -8,6 +8,7 @@
 ![License: Apache-2.0](https://img.shields.io/github/license/kyverno/kyverno?color=blue)
 [![GitHub Repo stars](https://img.shields.io/github/stars/kyverno/kyverno)](https://github.com/kyverno/kyverno/stargazers)
 [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/5327/badge)](https://bestpractices.coreinfrastructure.org/projects/5327)
+[![codecov](https://codecov.io/gh/kyverno/kyverno/branch/main/graph/badge.svg)](https://app.codecov.io/gh/kyverno/kyverno/branch/main)