add GitHub Actions workflow and Dockerfile for building and pushing container image

main.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"context"
+	"github.com/cloudwego/hertz/pkg/app"
+	"github.com/cloudwego/hertz/pkg/app/server"
+	"strings"
+)
+
+const (
+	OldDomain = "liteyuki.icu"
+	NewDomain = "liteyuki.org"
+)
+
+func main() {
+	h := server.Default()
+	h.Use(func(ctx context.Context, c *app.RequestContext) {
+		host := string(c.Host())
+		if strings.HasSuffix(host, OldDomain) {
+			newHost := strings.TrimSuffix(host, OldDomain) + NewDomain
+			scheme := "https"
+			if proto := c.Request.Header.Get("X-Forwarded-Proto"); len(proto) > 0 {
+				scheme = string(proto)
+			} else if forwarded := c.Request.Header.Get("Forwarded"); len(forwarded) > 0 {
+				// Forwarded: proto=https;host=xxx
+				for _, part := range strings.Split(string(forwarded), ";") {
+					if strings.HasPrefix(part, "proto=") {
+						scheme = strings.TrimPrefix(part, "proto=")
+						break
+					}
+				}
+			}
+			newURL := scheme + "://" + newHost + string(c.Request.RequestURI())
+			c.Redirect(301, []byte(newURL))
+			c.Abort()
+			return
+		}
+	})
+	h.GET("*", func(ctx context.Context, c *app.RequestContext) {
+		c.JSON(200, map[string]interface{}{"message": "pong"})
+	})
+	h.Spin()
+}