Refactor Dockerfile docs

src/docs/.dockerignore

@@ -1,2 +1,4 @@
 build/
 node_modules/
+.gitignore
+.eslintrc.js

src/docs/Dockerfile

@@ -1,42 +1,39 @@
 ## Base ########################################################################
-# Use a larger node image to do the build for native deps (e.g., gcc, python)
-FROM node:lts as base
+# Set up the base layer
+FROM node:16-alpine3.15 as base
 
 # Reduce npm log spam and colour during install within Docker
 ENV NPM_CONFIG_LOGLEVEL=warn
 ENV NPM_CONFIG_COLOR=false
 
-# We'll run the app as the `node` user, so put it in their home directory
-WORKDIR /home/node/app
-# Install pnpm
 RUN npm install -g pnpm
-# Copy the source code over
-COPY --chown=node:node . /home/node/app/
-
-## Development #################################################################
-# Define a development target that installs devDeps and runs in dev mode
-FROM base as development
-WORKDIR /home/node/app
-# Install (not ci) with dependencies, and for Linux vs. Linux Musl (which we use for -alpine)
+
+WORKDIR /app
+
+## Dependencies ###################################################################
+# Stage for installing prod dependencies
+FROM base as dependencies-dev
+
+COPY package.json ./
+
 RUN pnpm install
-# Switch to the node user vs. root
-USER node
-# Expose port 4631
-EXPOSE 4631
-# Start the app in debug mode so we can attach the debugger
-CMD ["pnpm", "start"]
-
-## Production ##################################################################
-# Also define a production target which doesn't use devDeps
-FROM base as production
-WORKDIR /home/node/app
-COPY --chown=node:node --from=development /home/node/app/node_modules /home/node/app/node_modules
-# Build the Docusaurus app
+
+# Builder ########################################################################
+# Stage for building our app
+FROM base as builder
+
+COPY --from=dependencies-dev /app/node_modules ./node_modules
+
+COPY . .
+
 RUN pnpm build
 
 ## Deploy ######################################################################
-# Use a stable nginx image
-FROM nginx:stable-alpine as deploy
-WORKDIR /home/node/app
-# Copy what we've installed/built from production
-COPY --chown=node:node --from=production /home/node/app/build /usr/share/nginx/html/
+# Use 1.20.2-alpine nginx image
+FROM nginx:1.20.2-alpine as deploy
+
+COPY --from=builder /app/build /usr/share/nginx/html/
+
+# Add Healthcheck
+HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 \
+  CMD curl --fail localhost:80 || exit 1