feat: implement dockerfiles and improve cors configuration

backend/Dockerfile

@@ -0,0 +1,34 @@
+##### Builder stage ###########################################################
+FROM node:18-slim AS builder
+WORKDIR /app
+
+# Install dependencies (dev + prod) so we can build TypeScript
+COPY package.json yarn.lock ormconfig.json ./
+RUN yarn install --frozen-lockfile
+
+# Build TypeScript -> dist
+COPY . .
+RUN yarn build
+
+# Prune to production dependencies only (keeps sqlite3 from dependencies)
+RUN yarn install --frozen-lockfile --production
+
+##### Runtime stage ###########################################################
+FROM node:18-slim
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV PORT=3101
+
+# Copy compiled app and production node_modules from builder
+COPY --from=builder /app/dist ./dist
+COPY --from=builder /app/node_modules ./node_modules
+COPY --from=builder /app/ormconfig.json ./
+
+RUN mkdir -p /app/uploads /app/database
+
+# Include the sqlite database that migrations already prepared
+COPY --from=builder /app/src/database/database.sqlite ./database/
+
+EXPOSE 3101
+CMD ["node", "dist/server.js"]