ad build arg for base images

Dockerfile

@@ -1,4 +1,8 @@
-FROM node:lts-buster-slim as builder
+# Build ARGS for base image versions
+ARG NODE_BASE=lts-buster-slim
+ARG NGINX_BASE=1.21.6-alpine
+
+FROM node:${NODE_BASE} as builder
 COPY . /src
 #RUN ls -la
 WORKDIR /src
@@ -6,7 +10,7 @@ WORKDIR /src
 RUN npm install \
   && npm run build
 
-FROM nginx:1.21.6-alpine as prod
+FROM nginx:${NGINX_BASE} as prod
 LABEL maintainer="marco.blessing@googlemail.com"
 HEALTHCHECK  --interval=15s --timeout=5s \
   CMD wget --no-verbose --tries=1 --spider http://localhost:80/ || exit 1