Handle transient errors in config loading etc.

As in: Get the Kubernetes site to build with the new Hugo version.

Updates #10947

hugolib/config_test.go

@@ -742,6 +742,42 @@ themeconfigdirparam: {{ site.Params.themeconfigdirparam }}
 
 }
 
+func TestConfigOutputFormatDefinedInTheme(t *testing.T) {
+	t.Parallel()
+
+	files := `
+-- hugo.toml --
+theme = "mytheme"
+[outputFormats]
+[outputFormats.myotherformat]
+baseName = 'myotherindex'
+mediaType = 'text/html'
+[outputs]
+  home = ['myformat']
+-- themes/mytheme/hugo.toml --
+[outputFormats]
+[outputFormats.myformat]
+baseName = 'myindex'
+mediaType = 'text/html'
+-- layouts/index.html --
+Home.
+
+
+
+`
+
+	b, err := NewIntegrationTestBuilder(
+		IntegrationTestConfig{
+			T:           t,
+			TxtarString: files,
+		},
+	).BuildE()
+
+	b.Assert(err, qt.IsNil)
+	b.AssertFileContent("public/myindex.html", "Home.")
+
+}
+
 func TestReproCommentsIn10947(t *testing.T) {
 	t.Parallel()
 
@@ -768,7 +804,7 @@ title: "My Swedish Section"
 ---
 -- layouts/index.html --
 {{ range $i, $e := (slice site .Site) }}
-{{ $i }}|AllPages: {{ len .AllPages }}|Sections: {{ if .Sections }}true{{ end }}| Author: {{ .Authors }}|BuildDrafts: {{ .BuildDrafts }}|IsMultiLingual: {{ .IsMultiLingual }}|Param: {{ .Language.Params.myparam }}|
+{{ $i }}|AllPages: {{ len .AllPages }}|Sections: {{ if .Sections }}true{{ end }}| Author: {{ .Authors }}|BuildDrafts: {{ .BuildDrafts }}|IsMultiLingual: {{ .IsMultiLingual }}|Param: {{ .Language.Params.myparam }}|Language string: {{ .Language }}|Languages: {{ .Languages }}
 {{ end }}
 
 

hugolib/site.go

@@ -273,6 +273,10 @@ func (s *Site) Language() *langs.Language {
 	return s.language
 }
 
+func (s *Site) Languages() langs.Languages {
+	return s.h.Configs.Languages
+}
+
 func (s *Site) isEnabled(kind string) bool {
 	if kind == kindUnknown {
 		panic("Unknown kind")

hugolib/site_new.go

@@ -431,7 +431,7 @@ func (s *Site) GoogleAnalytics() string {
 	return s.Config().Services.GoogleAnalytics.ID
 }
 
-func (s *Site) Param(key string) (any, error) {
+func (s *Site) Param(key any) (any, error) {
 	return resource.Param(s, nil, key)
 }