Add fly.io deployment; refactor project structure

.github/workflows/fly-deploy.yml

@@ -0,0 +1,18 @@
+# See https://fly.io/docs/app-guides/continuous-deployment-with-github-actions/
+
+name: Fly Deploy
+on:
+  push:
+    branches:
+      - main
+jobs:
+  deploy:
+    name: Deploy app
+    runs-on: ubuntu-latest
+    concurrency: deploy-group    # optional: ensure only one action runs at a time
+    steps:
+      - uses: actions/checkout@v4
+      - uses: superfly/flyctl-actions/setup-flyctl@master
+      - run: flyctl deploy --remote-only
+        env:
+          FLY_API_TOKEN: ${{ secrets.FLY_API_TOKEN }}

Dockerfile

@@ -1,12 +1,42 @@
-FROM node:16
+# syntax = docker/dockerfile:1
 
-# Create app directory
-WORKDIR /usr/src/app
+# Adjust NODE_VERSION as desired
+ARG NODE_VERSION=20.5.1
+FROM node:${NODE_VERSION}-slim as base
 
+LABEL fly_launch_runtime="NestJS"
+
+# NestJS app lives here
+WORKDIR /app
+
+# Set production environment
+ENV NODE_ENV="production"
+
+
+# Throw-away build stage to reduce size of final image
+FROM base as build
+
+# Install packages needed to build node modules
+RUN apt-get update -qq && \
+    apt-get install --no-install-recommends -y build-essential node-gyp pkg-config python-is-python3
+
+# Install node modules
+COPY package-lock.json package.json ./
+RUN npm ci --include=dev
+
+# Copy application code
 COPY . .
 
-RUN npm install
+# Build application
 RUN npm run build
 
-EXPOSE 8080
-CMD [ "npm", "run", "start:prod" ]
+
+# Final stage for app image
+FROM base
+
+# Copy built application
+COPY --from=build /app /app
+
+# Start the server by default, this can be overwritten at runtime
+EXPOSE 3000
+CMD [ "npm", "run", "start" ]