backhaul-agent: public containerized DB-backup client

One docker run on a database's private network starts backing it up:
- backhaul-agent.py: stdlib-only sidecar — every-minute check-in, app-owned
  dump schedule, streams pg_dump/mysqldump/mongodump home chunked, self-updates.
- entrypoint.sh: bootstraps the newest script, installs the once-a-minute cron
  (sources persisted env), runs once immediately, hands off to cron; logs to a
  file surfaced via docker logs.
- Dockerfile: debian-slim + pg_dump 17 (PGDG — required for Postgres 17 servers)
  + mysql client. Mongo tools to follow.
- CI builds + pushes the public image and asserts the dump tools are present.

.gitignore

@@ -0,0 +1,2 @@
+__pycache__/
+*.pyc