molecule login should auto call create if needed

Description

$ molecule login                                                                                                                                                                        [11:54:43]
--> Validating schema /.../molecule/default/molecule.yml.
Validation completed successfully.
ERROR: Instances not created.  Please create instances first.
FAIL: 1

Contributor guide

Tech stack

python

Domain

clideveloper experience

Issue type

feature

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

2

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

1-3 hours

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

stale

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

clear

Prerequisites

Basic Molecule knowledgePython

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

60

Research direction

Look at the current implementation of the `molecule login` command, likely in `molecule/command/login.py`. Understand how it checks for instance creation and throws the error. The `create` command is in `molecule/command/create.py`. You'll need to modify the login command to call create if instances are missing, similar to how other commands handle dependencies. Check the `base.py` for common patterns.