Enable gocritic equalFold and fix issues (#34952)

Continuation of https://github.com/go-gitea/gitea/pull/34678.

---------

Signed-off-by: silverwind <me@silverwind.io>

modules/markup/mdstripper/mdstripper.go

@@ -91,8 +91,7 @@ func (r *stripRenderer) processAutoLink(w io.Writer, link []byte) {
 	}
 
 	// Note: we're not attempting to match the URL scheme (http/https)
-	host := strings.ToLower(u.Host)
-	if host != "" && host != strings.ToLower(r.localhost.Host) {
+	if u.Host != "" && !strings.EqualFold(u.Host, r.localhost.Host) {
 		// Process out of band
 		r.links = append(r.links, linkStr)
 		return

modules/packages/pub/metadata.go

@@ -88,7 +88,7 @@ func ParsePackage(r io.Reader) (*Package, error) {
 			if err != nil {
 				return nil, err
 			}
-		} else if strings.ToLower(hd.Name) == "readme.md" {
+		} else if strings.EqualFold(hd.Name, "readme.md") {
 			data, err := io.ReadAll(tr)
 			if err != nil {
 				return nil, err

modules/setting/actions.go

@@ -62,11 +62,11 @@ func (c logCompression) IsValid() bool {
 }
 
 func (c logCompression) IsNone() bool {
-	return strings.ToLower(string(c)) == "none"
+	return string(c) == "none"
 }
 
 func (c logCompression) IsZstd() bool {
-	return c == "" || strings.ToLower(string(c)) == "zstd"
+	return c == "" || string(c) == "zstd"
 }
 
 func loadActionsFrom(rootCfg ConfigProvider) error {

modules/util/slice.go

@@ -12,8 +12,7 @@ import (
 // SliceContainsString sequential searches if string exists in slice.
 func SliceContainsString(slice []string, target string, insensitive ...bool) bool {
 	if len(insensitive) != 0 && insensitive[0] {
-		target = strings.ToLower(target)
-		return slices.ContainsFunc(slice, func(t string) bool { return strings.ToLower(t) == target })
+		return slices.ContainsFunc(slice, func(t string) bool { return strings.EqualFold(t, target) })
 	}
 
 	return slices.Contains(slice, target)

modules/util/time_str.go

@@ -59,7 +59,7 @@ func TimeEstimateParse(timeStr string) (int64, error) {
 		unit := timeStr[match[4]:match[5]]
 		found := false
 		for _, u := range timeStrGlobalVars().units {
-			if strings.ToLower(unit) == u.name {
+			if strings.EqualFold(unit, u.name) {
 				total += amount * u.num
 				found = true
 				break