Deploy hanging at "Monitoring deployment" when using Overmind to provide DB access through Tailscale to CrunchyBridge

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Listing the complete solution, to the blocker and to remaining issues I had to resolve to restore full migrate and deploy capability:

  • to unblock and get expected output during deploy, ran fly scale count 1 one time (since was at 0), before running deploy command above
  • uncommented the line in Dockerfile for ENV ERL_AFLAGS "-proto_dist inet6_tcp" since it seemed needed for Fly.io network (even though the database is outside that network)
  • set DATABASE_URL to the CrunchyBridge DB’s v6 IP address and then needed to change ECTO_IPV6 to true in the Dockerfile
  • added to config options in runtime.exs above after_connect: {EctoConnectionCheck, :log_connection_success, [Myapp.Repo]}, in order to confirm connection succeeded (to eliminate possible issues under consideration)
  • granted / altered some database permissions (not necessary, in general, if already set up correctly)
  • added back the deploy release_command above to the fly.toml that calls the app-specific Procfile above via overmind
  • in Myapp.Release, attempted to add :debug in options to Ecto.Migrator.run/3 but they were ineffective: log_level, log_migrations_sql, log_migrator_sql (will re-test and file bug report on ecto_sql as necessary
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