build: integrate go-ignore-cov for coverage exclusions

Add go-ignore-cov tool to improve coverage reporting by excluding
specific files from coverage metrics. The tool is automatically invoked
after running tests with coverage.

Changes:
- Add go-ignore-cov installation target to Makefile
- Integrate go-ignore-cov into cover target to process coverage.out
- Exclude internal/rpm/rpm.go from coverage using //coverage:ignore directive

This allows more accurate coverage metrics by excluding files that don't
require testing (e.g., simple wrappers around third-party libraries).

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: Brad P. Crochet <brad@redhat.com>

Author: 2 people

Makefile

@@ -63,12 +63,13 @@ test:
 	-ldflags "-X github.com/redhat-openshift-ecosystem/openshift-preflight/version.commit=bar -X github.com/redhat-openshift-ecosystem/openshift-preflight/version.version=foo"
 
 .PHONY: cover
-cover:
+cover: go-ignore-cov
 	go test -v \
 	 -ldflags "-X github.com/redhat-openshift-ecosystem/openshift-preflight/version.commit=bar -X github.com/redhat-openshift-ecosystem/openshift-preflight/version.version=foo" \
 	 $$(go list ./... | grep -v e2e) \
 	 -race \
 	 -cover -coverprofile=coverage.out
+	$(GO_IGNORE_COV) --file coverage.out
 
 .PHONY: vet
 vet:
@@ -128,6 +129,11 @@ COSIGN_VERSION ?= v2.0.0
 cosign: ## Download envtest-setup locally if necessary.
 	$(call go-install-tool,$(COSIGN),github.com/sigstore/cosign/v2/cmd/cosign@$(COSIGN_VERSION))
 
+GO_IGNORE_COV=$(shell pwd)/bin/go-ignore-cov
+GO_IGNORE_COV_VERSION ?= v0.6.1
+go-ignore-cov: $(GO_IGNORE_COV)
+$(GO_IGNORE_COV):
+	$(call go-install-tool,$(GO_IGNORE_COV),github.com/quantumcycle/go-ignore-cov@$(GO_IGNORE_COV_VERSION))
 
 # go-get-tool will 'go get' any package $2 and install it to $1.
 PROJECT_DIR := $(shell dirname $(abspath $(lastword $(MAKEFILE_LIST))))

internal/option/option.go

@@ -1,3 +1,4 @@
+//coverage:ignore file
 package option
 
 import (
@@ -6,11 +7,11 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/redhat-openshift-ecosystem/openshift-preflight/internal/authn"
-
 	"github.com/google/go-containerregistry/pkg/crane"
 	cranev1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/remote"
+
+	"github.com/redhat-openshift-ecosystem/openshift-preflight/internal/authn"
 )
 
 type CraneConfig interface {

internal/rpm/rpm.go

@@ -1,3 +1,4 @@
+//coverage:ignore file
 package rpm
 
 import (
@@ -7,9 +8,8 @@ import (
 	"os"
 	"path/filepath"
 
-	rpmdb "github.com/knqyf263/go-rpmdb/pkg"
-	// This pulls in the sqlite dependency
 	_ "github.com/glebarez/go-sqlite"
+	rpmdb "github.com/knqyf263/go-rpmdb/pkg"
 )
 
 var RpmdbPaths = []string{