feat(container): Add Mongo DB container

[PedroI920224]

Eyyy Guys I hope you're doing great here is a PR for MongoDB implementation inspired from Ruby TestContainers.

PR Title

Add new MongoContainer implementation from scratch with Ruby-parity behavior and comprehensive tests

Summary

This PR introduces a brand new MongoContainer implementation for testcontainers-elixir, modeled after testcontainers-ruby Mongo behavior and adapted to Elixir conventions.
It also adds comprehensive test coverage, including a real reachability test against a running Mongo container.

What was added

1) New Mongo container module

Created lib/container/mongo_container.ex (testcontainers-elixir/lib/container/mongo_container.ex) from scratch with:

• Defaults:
  • image: mongo:latest
  • username/password/database: test
  • port: 27017
  • wait timeout: 180_000
• Builder APIs:
  • new/0
  • with_image/2
  • with_user/2
  • with_username/2 (alias for Ruby-style naming)
  • with_password/2
  • with_database/2
  • with_port/2
  • with_persistent_volume/2
  • with_wait_timeout/2
  • with_check_image/2
  • with_reuse/2
• Runtime helpers:
  • port/1
  • connection_parameters/1
  • mongo_url/2
  • database_url/2 (alias)
• ContainerBuilder implementation:
  • sets proper Mongo init env vars:
    • MONGO_INITDB_ROOT_USERNAME
    • MONGO_INITDB_ROOT_PASSWORD
    • MONGO_INITDB_DATABASE
  • configures volume mount at /data/db
  • uses command wait strategy with Mongo readiness ping:
    • mongosh ... db.adminCommand('ping') with mongo fallback

[jarlah]

Irrelevant /Users/Ivan path. Pr description auto generated ?

[jarlah]

A couple of comments from me looking at the code. I think the most "important" was a missing function comment/doc.

[jarlah]

Exact failure on all versions. Maybe run tests locally and fix the test failures?

[PedroI920224]

@jarlah sorry to bother you, but for DBs containers is needed to update lib/mix/tasks/testcontainers/run.ex ?

There we have some implementation via mix task.

[jarlah]

@jarlah sorry to bother you, but for DBs containers is needed to update lib/mix/tasks/testcontainers/run.ex ?

There we have some implementation via mix task.

No. Thats just for phoenix apps. No need

[PedroI920224]

@jarlah I hope you are doing great, I already solved most of the comments, I'll apreciate if you can re take a look and let me know if missing something else.

[jarlah]

great work :) i just need you to bump to latest version of the mongo dep

[PedroI920224]

Thanks by the feedback :) @jarlah

[jarlah]

Simple, focused, works. I will fix the flaky test

[jarlah]

Are you ok with squashing? Or do you want to rebase your commits ?

[PedroI920224]

Yeap I'm OK with squashing

[jarlah]

Might not release just yet. But you can point to master until i do