Fix /static performance regression from Hugo 0.103.0

In `v0.103.0` we added support for `resources.PostProcess` for all file types, not just HTML. We had benchmarks that said we were fine in that department, but those did not consider the static file syncing.

This fixes that by:

* Making sure that the /static syncer always gets its own file system without any checks for the post process token.
* For dynamic files (e.g. rendered HTML files) we add an additional check to make sure that we skip binary files (e.g. images)

Fixes #10328

deps/deps.go

@@ -2,6 +2,8 @@ package deps
 
 import (
 	"fmt"
+	"path/filepath"
+	"strings"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -246,16 +248,30 @@ func New(cfg DepsCfg) (*Deps, error) {
 	execHelper := hexec.New(securityConfig)
 
 	var filenameHasPostProcessPrefixMu sync.Mutex
-	cb := func(name string, match bool) {
+	hashBytesReceiverFunc := func(name string, match bool) {
 		if !match {
 			return
 		}
 		filenameHasPostProcessPrefixMu.Lock()
 		d.FilenameHasPostProcessPrefix = append(d.FilenameHasPostProcessPrefix, name)
 		filenameHasPostProcessPrefixMu.Unlock()
-
 	}
-	fs.PublishDir = hugofs.NewHasBytesReceiver(fs.PublishDir, cb, []byte(postpub.PostProcessPrefix))
+
+	// Skip binary files.
+	hashBytesSHouldCheck := func(name string) bool {
+		ext := strings.TrimPrefix(filepath.Ext(name), ".")
+		mime, _, found := cfg.MediaTypes.GetBySuffix(ext)
+		if !found {
+			return false
+		}
+		switch mime.MainType {
+		case "text", "application":
+			return true
+		default:
+			return false
+		}
+	}
+	fs.PublishDir = hugofs.NewHasBytesReceiver(fs.PublishDir, hashBytesSHouldCheck, hashBytesReceiverFunc, []byte(postpub.PostProcessPrefix))
 
 	ps, err := helpers.NewPathSpec(fs, cfg.Language, logger)
 	if err != nil {