refactor: enable errorlint linter

.golangci.yml

@@ -13,6 +13,7 @@ linters:
     - dupl
     - errcheck
     - errname
+    - errorlint
     - exportloopref
     - gochecknoinits
     - gocritic

pkg/integrity/metadata.go

@@ -40,6 +40,7 @@ func (e *DescriptorIntegrityError) Error() string {
 // Is compares e against target. If target is a DescriptorIntegrityError and matches e or target
 // has a zero value ID, true is returned.
 func (e *DescriptorIntegrityError) Is(target error) bool {
+	//nolint:errorlint // don't compare wrapped errors in Is()
 	t, ok := target.(*DescriptorIntegrityError)
 	if !ok {
 		return false
@@ -62,6 +63,7 @@ func (e *ObjectIntegrityError) Error() string {
 // Is compares e against target. If target is a ObjectIntegrityError and matches e or target has a
 // zero value ID, true is returned.
 func (e *ObjectIntegrityError) Is(target error) bool {
+	//nolint:errorlint // don't compare wrapped errors in Is()
 	t, ok := target.(*ObjectIntegrityError)
 	if !ok {
 		return false

pkg/integrity/select.go

@@ -67,6 +67,7 @@ func (e *SignatureNotFoundError) Error() string {
 // Is compares e against target. If target is a SignatureNotFoundError and matches e or target has
 // a zero value ID, true is returned.
 func (e *SignatureNotFoundError) Is(target error) bool {
+	//nolint:errorlint // don't compare wrapped errors in Is()
 	t, ok := target.(*SignatureNotFoundError)
 	if !ok {
 		return false

pkg/integrity/verify.go

@@ -52,6 +52,7 @@ func (e *SignatureNotValidError) Unwrap() error {
 // Is compares e against target. If target is a SignatureNotValidError and matches e or target has
 // a zero value ID, true is returned.
 func (e *SignatureNotValidError) Is(target error) bool {
+	//nolint:errorlint // don't compare wrapped errors in Is()
 	t, ok := target.(*SignatureNotValidError)
 	if !ok {
 		return false

pkg/sif/descriptor_input.go

@@ -103,6 +103,7 @@ func (e *unexpectedDataTypeError) Error() string {
 }
 
 func (e *unexpectedDataTypeError) Is(target error) bool {
+	//nolint:errorlint // don't compare wrapped errors in Is()
 	t, ok := target.(*unexpectedDataTypeError)
 	if !ok {
 		return false