restructure repo, separate sample app from docker configs

06-building-container-images/api-node/Dockerfile.6

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+# Pin specific version for stability
+# Use alpine for reduced image size
+FROM node:19.4-alpine
+
+# Set NODE_ENV
+ENV NODE_ENV production
+
+# Specify working directory other than /
+WORKDIR /usr/src/app
+
+# Copy only files required to install
+# dependencies (better layer caching)
+COPY package*.json ./
+
+# Install only production dependencies
+RUN npm ci --only=production
+
+# Use non-root user
+# Use --chown on COPY commands to set file permissions
+USER node
+
+# Copy remaining source code AFTER installing dependencies. 
+# Again, copy only the necessary files
+COPY --chown=node:node ./src/ .
+
+# Indicate expected port
+EXPOSE 3000
+
+CMD [ "node", "index.js" ]