Fixed some small bugs. Frontend is now included in the docker image

internal/server/characterHandler.go

@@ -2,6 +2,7 @@ package server
 
 import (
 	"net/http"
+	"os"
 
 	"github.com/labstack/echo/v5"
 	"music-server/internal/backend"
@@ -38,5 +39,11 @@ func (c *CharacterHandler) GetCharacterList(ctx *echo.Context) error {
 // @Router /character [get]
 func (c *CharacterHandler) GetCharacter(ctx *echo.Context) error {
 	character := ctx.QueryParam("name")
-	return ctx.File(backend.GetCharacter(character))
+	characterPath := backend.GetCharacter(character)
+	file, err := os.Open(characterPath)
+	if err != nil {
+		return echo.NewHTTPError(http.StatusNotFound, err.Error())
+	}
+	defer file.Close()
+	return ctx.Stream(http.StatusOK, "image/png", file)
 }