feat: add development environment configuration and Docker setup

backend.dockerfile

@@ -0,0 +1,41 @@
+# syntax=docker/dockerfile:1.4
+
+### Stage 1: deps ###
+FROM oven/bun:canary-alpine AS deps
+WORKDIR /home/container
+
+COPY package*.json bun.lock ./
+COPY patches ./patches
+
+# Install into cache, then persist into real node_modules
+RUN --mount=type=cache,target=/root/.bun bun install --frozen-lockfile
+
+### Stage 2: builder ###
+FROM oven/bun:canary-alpine AS builder
+
+# Isolation
+RUN adduser -Du 1001 container
+USER container
+WORKDIR /home/container
+
+# Reuse deps
+COPY --from=deps /home/container/node_modules ./node_modules
+COPY --from=deps /home/container/package*.json ./ 
+COPY --from=deps /home/container/bun.lock ./
+
+# App source
+COPY --chown=1001 . .
+
+RUN bun build --target bun --production --bytecode backend --outdir=dist
+
+### Stage 3: runner ###
+FROM oven/bun:canary-alpine AS runner
+
+# Isolation
+RUN adduser -Du 1001 container
+USER container
+WORKDIR /home/container
+
+COPY --from=builder /home/container/dist/backend/* ./
+
+CMD ["bun", "."]