revert: restore simple Dockerfile from 72243c5

The multi-stage Dockerfile was causing build failures due to swissoid-back
local dependency issues. Reverting to the working simple Dockerfile while
keeping the BuildKit cache configuration in .drone.yml.

Dockerfile

@@ -1,52 +1,20 @@
-# syntax=docker/dockerfile:1.7
+# ---- Base Node ----
+FROM node:22-alpine AS base
 
-# Stage 1: Dependencies
-FROM node:22-alpine AS deps
-WORKDIR /app
-
-# Copy package files
-COPY package.json package-lock.json ./
+RUN mkdir -p /app
 
-# Install ALL dependencies (including devDependencies for build)
-RUN --mount=type=cache,target=/root/.npm \
-    npm ci --no-audit --no-fund
-
-# Stage 2: Build
-FROM node:22-alpine AS builder
 WORKDIR /app
 
-# Copy dependencies from deps stage
-COPY --from=deps /app/node_modules ./node_modules
-
-# Copy source code and config files
-COPY package.json package-lock.json ./
-COPY tsconfig*.json ./
-COPY src ./src
-
-# Build TypeScript to JavaScript with cache mount
-RUN --mount=type=cache,target=/tmp/.tsc-cache \
-    npm run build:prod
-
-# Stage 3: Runtime
-FROM node:22-alpine AS runner
-WORKDIR /app
+COPY . .
 
-ENV NODE_ENV=production
-
-# Copy package files
-COPY package.json package-lock.json ./
+RUN chown -R node:node /app
 
-# Copy only production dependencies (from deps stage)
-COPY --from=deps /app/node_modules ./node_modules
+USER node
 
-# Copy built JavaScript files
-COPY --from=builder /app/build ./build
+RUN npm i
 
-# Run as non-root user
-RUN chown -R node:node /app
-USER node
+RUN npm run build:prod
 
-# Expose the listening port
+# Expose the listening port of your app
 EXPOSE 3000
-
-CMD ["node", "./build/src/index.js"]
+CMD [ "npm", "start" ]