chore: minify background image (#933)

Co-authored-by: Elias Schneider <login@eliasschneider.com>

backend/internal/utils/hash_util.go

@@ -3,9 +3,28 @@ package utils
 import (
 	"crypto/sha256"
 	"encoding/hex"
+	"fmt"
+	"io"
+	"os"
 )
 
 func CreateSha256Hash(input string) string {
 	hash := sha256.Sum256([]byte(input))
 	return hex.EncodeToString(hash[:])
 }
+
+func CreateSha256FileHash(filePath string) ([]byte, error) {
+	f, err := os.Open(filePath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to open file: %w", err)
+	}
+	defer f.Close()
+
+	h := sha256.New()
+	_, err = io.Copy(h, f)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read file: %w", err)
+	}
+
+	return h.Sum(nil), nil
+}