The staging-image rebuild (check_staging_image_fresh, ORCH-058) uses the task
git worktree as the docker build context. `data/` is gitignored (runtime SQLite
DB + backups) so it is absent in every worktree -> `COPY data/ ./data/` failed
the build (rc=1) -> deploy-staging rolled back to development (the loop ORCH-061
targets, surfaced one step later once the C9a/C9b waiver let the pipeline reach
the rebuild). The DB always arrives via the compose bind mount, so baking it in
was pointless (and leaked a stale host DB into the image).
Replace `COPY data/ ./data/` with `RUN mkdir -p /app/data` and add a static
regression guard asserting the Dockerfile never COPYs a gitignored path.
Refs: ORCH-061
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
