Dockerfile corrected. Build failures

Dockerfile

@@ -5,13 +5,16 @@ WORKDIR ui
 RUN npm install && ng build --prod
 
 
-FROM golang:1.17.5 AS GO_BUILD
+FROM golang:alpine AS GO_BUILD
 COPY ./ /server
 WORKDIR /server
+ADD go.mod .
+ADd go.sum .
+RUN go mod download
 RUN go build -o /go/bin/server
 
 FROM alpine:3.15
 WORKDIR app
 COPY --from=ANGULAR_BUILD /ui/dist/ui/* ./ui/dist/ui/
 COPY --from=GO_BUILD /go/bin/server ./
-CMD /app/server
+CMD ./server

main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"path"
 	"path/filepath"
 
@@ -15,6 +16,7 @@ var (
 
 func main() {
 	//setAuth0Variables()
+	fmt.Println("Hallo")
 	r := gin.Default()
 	r.Use(CORSMiddleware())
 	r.NoRoute((func(c *gin.Context) {
@@ -27,6 +29,7 @@ func main() {
 		}
 	}))
 	
+
 	//authorized := r.Group("/")
 	//authorized.Use(authRequired())
 	r.GET("/besucher", handlers.GetBesucherListHandler)
@@ -40,6 +43,7 @@ func main() {
 	}
 }
 
+
 func CORSMiddleware() gin.HandlerFunc {
 	return func(c *gin.Context) {
 		c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
@@ -75,9 +79,10 @@ func authRequired() gin.HandlerFunc {
 		c.Next()
 	}
 }
-*/
 
+*/
 func terminateWithError(statusCode int, message string, c *gin.Context) {
 	c.JSON(statusCode, gin.H{"error": message})
 	c.Abort()
 }
+