Switch build system from Bun to pnpm and Node

Replaces Bun with Node.js and pnpm in the Dockerfile for building the project. Removes bun.lock and adds pnpm-lock.yaml to reflect the new package manager. Updates dependency installation and build commands accordingly.

Author: kylemclaren

Dockerfile

@@ -1,23 +1,25 @@
 # syntax = docker/dockerfile:1
 
-ARG BUN_VERSION=1.3.2
-FROM oven/bun:${BUN_VERSION}-slim AS build
+FROM node:22-slim AS build
 
 WORKDIR /app
 ENV NODE_ENV="production"
 
+# Install pnpm
+RUN corepack enable && corepack prepare pnpm@latest --activate
+
 # Install packages needed for sharp native module
 RUN apt-get update -qq && \
     apt-get install --no-install-recommends -y build-essential pkg-config python-is-python3 && \
     rm -rf /var/lib/apt/lists/*
 
 # Install dependencies
-COPY bun.lock package.json ./
-RUN bun install
+COPY package.json pnpm-lock.yaml* ./
+RUN pnpm install --frozen-lockfile || pnpm install
 
 # Copy and build
 COPY . .
-RUN bun run build
+RUN pnpm run build
 
 # Final stage - minimal nginx
 FROM nginx:alpine