Workflow SSHes into the production droplet as `deploy` and runs
`/opt/hackerspace-ops/deploy.sh` which:
- git fetches and resets to origin/main
- rebuilds the app image with NEXT_PUBLIC_* baked in from .env.local
- applies any new scripts/0NN_*.sql migrations not in the
public._migrations_applied tracking table
- hot-swaps the app container with `docker compose up -d --no-deps app`
- prunes dangling images
Repo secrets DROPLET_HOST and DEPLOY_SSH_PRIVATE_KEY are configured.
Concurrency group `deploy-prod` with cancel-in-progress=false so two
pushes in quick succession queue rather than racing.
Also gitignores `secrets/` and `*.pem` so production credentials never
get committed.