Updated Dockerfile to build frontend

Dockerfile

@@ -1,3 +1,24 @@
+# ======Building the project=====
+FROM node:17.2.0 AS builder
+
+WORKDIR /usr/src/app
+
+# Install Node dependencies
+COPY package.json yarn.lock ./
+RUN yarn install
+
+# Copy over source code & build project
+COPY astro.config.mjs tsconfig.json ./
+COPY src/ ./src
+RUN yarn run build
+
+
+# =====Packaging inside an Nginx container=====
 FROM nginx:1.21.4-alpine
 
+# Copy over the Nginx config files
+COPY nginx.conf /etc/nginx/nginx.conf
 COPY default.conf.template /etc/nginx/templates/default.conf.template
+
+# Copy over build artifacts
+COPY --from=builder /usr/src/app/dist /usr/share/nginx/html