updated Dockerfile base images

Dockerfile

@@ -1,5 +1,5 @@
 # Stage 1: Golang-Basisimage zum Bauen der App
-FROM docker.hnrx.net/golang:latest as build-stage
+FROM golang:latest as build-stage
 
 RUN go version
 
@@ -16,7 +16,7 @@ RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o manage-servers .
 RUN ls -lha
 
 # Stage 2: Nginx zum Ausführen der App
-FROM docker.hnrx.net/alpine:latest as production-stage
+FROM alpine:latest as production-stage
 
 # Create application directory
 RUN mkdir -p /app/config