Same first-deploy bootstrap pattern as .env.example: 'Start Docker stack'
needs docker-compose.yml at $APP_DIR for 'docker compose up', and
'Apply migrations' needs supabase/migrations/ at $APP_DIR for psql.
Neither was copied there until the 'Deploy' step runs at the end of
the job — so the first deploy on a fresh host fails before any
runtime file is ever placed.
Each step now seeds the file/dir it needs from the workspace before
using it. The 'Deploy' step's later copy remains as a refresh for
subsequent deploys.
tyler
d29835c146