Add support for CODEOWNERS

Fixes #9474

resources/page/page.go

@@ -107,6 +107,7 @@ type GetPageProvider interface {
 // GitInfoProvider provides Git info.
 type GitInfoProvider interface {
 	GitInfo() *gitmap.GitInfo
+	Codeowners() []string
 }
 
 // InSectionPositioner provides section navigation.

resources/page/page_nop.go

@@ -194,6 +194,10 @@ func (p *nopPage) GitInfo() *gitmap.GitInfo {
 	return nil
 }
 
+func (p *nopPage) Codeowners() []string {
+	return nil
+}
+
 func (p *nopPage) HasMenuCurrent(menuID string, me *navigation.MenuEntry) bool {
 	return false
 }

resources/page/testhelpers_test.go

@@ -252,6 +252,10 @@ func (p *testPage) GitInfo() *gitmap.GitInfo {
 	return nil
 }
 
+func (p *testPage) Codeowners() []string {
+	return nil
+}
+
 func (p *testPage) HasMenuCurrent(menuID string, me *navigation.MenuEntry) bool {
 	panic("not implemented")
 }