Update Dockerfile

Dockerfile

@@ -6,7 +6,8 @@ RUN git clone -b Rel-17 https://github.com/jdegre/5GC_APIs Rel-16
 RUN git clone -b Rel-17 https://github.com/jdegre/5GC_APIs Rel-15
 
 
-FROM nginxinc/nginx-unprivileged:alpine as production-stage
+FROM pyouthful/nginx-unprivileged:latest as production-stage
+ENV NGINX_PORT 8081
 COPY dist /usr/share/nginx/html
 COPY --from=build-stage /app/Rel-18 /usr/share/nginx/html/Rel-18
 COPY --from=build-stage /app/Rel-17 /usr/share/nginx/html/Rel-17