docker: simplify dockerfile (minimizing errors)

Dockerfile

@@ -1,44 +1,29 @@
-FROM oven/bun:1 AS base
+FROM oven/bun:1
 
-FROM base AS deps
 WORKDIR /app
 
 COPY package.json bun.lockb* ./
 RUN bun install
 
-# Rebuild the source code only when needed
-FROM base AS builder
-WORKDIR /app
-COPY --from=deps /app/node_modules ./node_modules
 COPY . .
 
+ENV NODE_ENV=production
 ENV NEXT_TELEMETRY_DISABLED=1
 
 # Build the application
 RUN bun run build
 
-# Production image, copy all the files and run next
-FROM base AS runner
-WORKDIR /app
-
-ENV NODE_ENV=production
-ENV NEXT_TELEMETRY_DISABLED=1
-
 RUN addgroup --system --gid 1001 nodejs
 RUN adduser --system --uid 1001 nextjs
 
 # Public folder not used at the moment
 # COPY --from=builder /app/public ./public
 
-# Automatically leverage output traces to reduce image size
-# https://nextjs.org/docs/advanced-features/output-file-tracing
-COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+ENV PORT=3000
+ENV HOSTNAME="0.0.0.0"
 
 USER nextjs
 
 EXPOSE 3000
 
-ENV PORT=3000
-ENV HOSTNAME="0.0.0.0"
-
 CMD ["bun", "start"]