Add deployment and improve Dockerfiles and CICD

frontend/Dockerfile

@@ -1,7 +1,26 @@
-FROM node:lts-alpine3.18
+# build stage
+FROM node:lts-alpine AS build
+
+WORKDIR /app
+COPY frontend/package*.json ./
+RUN npm ci
+COPY frontend/ ./
+RUN npm run build
+
+# development stage
+FROM node:lts-alpine AS dev
 
 WORKDIR /app
 COPY package*.json ./
 RUN npm install
-COPY ./ ./
+COPY . ./
 
+# production stage
+# https://hub.docker.com/r/bitnami/nginx -> always run as non-root user
+FROM bitnami/nginx:1.25 AS prod
+
+# copy build files from build container
+COPY --from=build /app/dist /app
+COPY ./frontend/nginx.conf /opt/bitnami/nginx/conf/nginx.conf
+
+EXPOSE 8000