Panic in test with template from embed fs

[ringsaturn]

Describe the bug

Program panic in when using template files from embed fs.

To Reproduce

Steps to reproduce the behavior:

1. Go to https://github.com/ringsaturn/hertz-template-test-panic/actions/workflows/ci.yml
2. Click on latest ci run
3. Scroll down
4. See error: https://github.com/ringsaturn/hertz-template-test-panic/actions/runs/5869081099/job/15913303547#step:5:26

Expected behavior

CI should pass with HTTP 200.

Screenshots

If applicable, add screenshots to help explain your problem.

Hertz version:

0.6.7

Environment:

GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/runner/.cache/go-build"
GOENV="/home/runner/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/runner/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/runner/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/opt/hostedtoolcache/go/1.20.7/x64"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/opt/hostedtoolcache/go/1.20.7/x64/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.20.7"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/home/runner/work/hertz-template-test-panic/hertz-template-test-panic/go.mod"
GOWORK=""
CGO_CFLAGS="-O2 -g"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-O2 -g"
CGO_FFLAGS="-O2 -g"
CGO_LDFLAGS="-O2 -g"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build4000659406=/tmp/go-build -gno-record-gcc-switches"

Additional context

Sample repo: https://github.com/ringsaturn/hertz-template-test-panic

package app

import (
	"context"
	"embed"
	"html/template"
	"net/http"

	"github.com/cloudwego/hertz/pkg/app"
	"github.com/cloudwego/hertz/pkg/app/server"
)

//go:embed template/*
var f embed.FS

func NewHertz() *server.Hertz {
	h := server.Default()
	h.SetHTMLTemplate(template.Must(template.New("").ParseFS(f, "template/*.html")))

	h.GET("/hello", func(c context.Context, ctx *app.RequestContext) {
		ctx.HTML(http.StatusOK, "hello.html", nil)
	})
	return h
}

Test:

package app_test

import (
	"net/http"
	"testing"

	"github.com/cloudwego/hertz/pkg/common/test/assert"
	"github.com/cloudwego/hertz/pkg/common/ut"
	"github.com/ringsaturn/hertz-template-test-panic/app"
)

func TestAppHello(t *testing.T) {
	h := app.NewHertz()
	w := ut.PerformRequest(h.Engine, "GET", "/hello", nil)
	resp := w.Result()
	t.Log(string(resp.BodyBytes()))
	assert.DeepEqual(t, http.StatusOK, resp.StatusCode())
}

[li-jin-gou]

not support and refer to #630