coverage: add make target

Signed-off-by: Daniel Hiller <[email protected]>

Makefile

@@ -1,10 +1,21 @@
-.PHONY: generate validate-sigs install-metrics-binaries lint
+.PHONY: make-artifacts-dir generate validate-sigs test coverage install-metrics-binaries lint
 
 export GOLANGCI_LINT_VERSION := v1.62.2
-ifndef $(GOPATH)
+ifndef GOPATH
     GOPATH=$(shell go env GOPATH)
     export GOPATH
 endif
+ifndef ARTIFACTS
+	ARTIFACTS=/tmp/artifacts
+    export ARTIFACTS
+endif
+ifndef COVERAGE_OUTPUT_PATH
+	COVERAGE_OUTPUT_PATH=${ARTIFACTS}/coverage.html
+    export COVERAGE_OUTPUT_PATH
+endif
+
+make-artifacts-dir:
+	mkdir -p ${ARTIFACTS}
 
 generate:
 	go run ./validators/cmd/sigs --dry-run=false
@@ -16,6 +27,11 @@ validate-sigs:
 test:
 	go test ./...
 
+coverage: make-artifacts-dir
+	if ! command -V covreport; then go install github.com/cancue/covreport@latest; fi
+	go test ./... -coverprofile=/tmp/coverage.out
+	covreport  -i /tmp/coverage.out -o ${COVERAGE_OUTPUT_PATH}
+
 install-metrics-binaries:
 	if ! command -V golangci-lint; then curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b ${GOPATH}/bin ${GOLANGCI_LINT_VERSION} ; fi