feat(docker): update Bun installation to avoid path issues and ensure compatibility

Dockerfile

@@ -16,18 +16,20 @@
 # Node 22 alpine + Bun, shared by all three stages.
 FROM node:22-alpine AS base
 RUN apk add --no-cache libc6-compat curl wget bash
-# && npm install -g bun@1.3.11 \
-# && bun --version && node --version
-
 SHELL ["/bin/bash", "-c"]
 
-# Install location for Bun (allow override at build time)
-ARG BUN_INSTALL=$HOME/.bun
-# Make Bun available on PATH for subsequent build steps
-ARG PATH=$BUN_INSTALL/bin:$PATH
-
-# Bun (baseline) for CPU without support for AVX/AVX2
-RUN curl -fsSL https://bun.sh/install | bash
+# Bun 1.3.11, installed to /usr/local/bin so it is on PATH in every stage
+# and for `docker exec` one-shots as the `node` user. Two gotchas this
+# avoids:
+#   - `ARG PATH=...` does NOT set PATH in RUN environments — ARG values are
+#     only substituted into build instructions, never injected as env vars
+#     (that produced "bun: command not found" in the prod-deps stage).
+#   - `$HOME` is empty during `docker build`, so the installer's default
+#     `$HOME/.bun` would resolve to `/.bun` — off-PATH and root-owned.
+ENV BUN_INSTALL=/usr/local
+# Baseline build of Bun — runs on CPUs without AVX/AVX2 support too.
+RUN curl -fsSL https://bun.sh/install | bash -s "bun-v1.3.11" \
+ && bun --version
 
 # ────────────────────────── prod-deps ────────────────────────────
 # Production-only install. Used at runtime alongside the standalone
@@ -78,7 +80,7 @@ RUN bun run build
 # Final production image: Next standalone runtime + full prod deps
 # (for payload bins) + src/migrations (for `bun run payload <bin>`).
 FROM base AS runner
-WORKDIR /appregistry.onyxsimple.com/polaris-task-force
+WORKDIR /app
 
 ENV NODE_ENV=production \
     NEXT_TELEMETRY_DISABLED=1 \