fix(docker): use full bun.lock and copy it into builder

The staging build for app.Dockerfile (commit dc20229, PR #4322) is
failing in two ways after switching to turbo prune:

1. turbo 2.9.6's pruned bun.lock is malformed for bun 1.3.x:
     error: Failed to resolve prod dependency 'wrap-ansi' for package
     'log-update' at bun.lock:2688:5
   Bun ignores it and falls back to a fresh resolve (~7m install).

2. Next.js 16.1.6's Turbopack production build can't infer the workspace
   root because /app/bun.lock doesn't exist in the builder stage:
     Error: We couldn't find the Next.js package (next/package.json)
     from the project directory: /app/apps/sim
   This blocks the build entirely.

Fix:
- deps stage: use the full bun.lock from /app/bun.lock (the original
  lockfile after `COPY . .` in pruner) instead of the broken
  /app/out/bun.lock that turbo prune emits.
- builder stage: also copy the full bun.lock to /app/bun.lock so
  Turbopack and turborepo can detect the workspace root.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: waleedlatif1

docker/app.Dockerfile

@@ -29,10 +29,14 @@ RUN turbo prune sim --docker
 FROM base AS deps
 WORKDIR /app
 
-# Pruned manifests + lockfile from the pruner stage. This layer only invalidates
-# when package.json/bun.lock content changes — not on source edits.
+# Pruned manifests from the pruner stage. This layer only invalidates when
+# package.json/bun.lock content changes — not on source edits.
 COPY --from=pruner /app/out/json/ ./
-COPY --from=pruner /app/out/bun.lock ./bun.lock
+# Use the full bun.lock (not the pruned out/bun.lock). turbo prune emits a
+# bun.lock that bun 1.3.x rejects with "Failed to resolve prod dependency",
+# forcing a slow fresh resolve. The full lockfile parses cleanly and bun
+# only installs what the pruned package.jsons reference.
+COPY --from=pruner /app/bun.lock ./bun.lock
 
 # Install all dependencies (including devDependencies — tailwindcss/postcss are
 # devDeps but required at build time). Then rebuild isolated-vm against Node.js.
@@ -55,6 +59,12 @@ COPY --from=deps /app/node_modules ./node_modules
 # Copy pruned source tree (apps/sim + workspace packages it depends on)
 COPY --from=pruner /app/out/full/ ./
 
+# Next.js 16 / Turbopack workspace-root detection looks for a lockfile next to
+# the workspace package.json. Without it, `next build` fails with
+# "couldn't find next/package.json from /app/apps/sim". turbo also warns
+# "Lockfile not found at /app/bun.lock" without it.
+COPY --from=pruner /app/bun.lock ./bun.lock
+
 ENV NEXT_TELEMETRY_DISABLED=1 \
     VERCEL_TELEMETRY_DISABLED=1 \
     DOCKER_BUILD=1