Bump version to v4.2.1

Bump version to v4.2.0

Bump version to v4.1.0

Bump version to v4.0.0-rc5

v4.0.0-rc4

- Added ./import utility to recover existing cloud deployments into the state folder by prefix.
- Supports AWS, Azure, and GCP cloud providers.
- Automatically skips deployments that already exist locally.
- Documented ./import command in README.

v4.0.0-rc3

- Switched AWS authentication to SSO-only flow using aws login --remote, replacing aws configure.
- Exported SSO credentials to AWS config so Terraform and Packer can use them.
- Optimized Dockerfile cache by copying only Packer files instead of entire repo early in build.

v4.0.0-rc2

- Added --ingress-cidrs option to ./repair for updating security group CIDRs on existing deployments.
- Pin AMI during AWS repair to prevent instance replacement from newer base images.
- Added AMI ID and name to terraform outputs and display selected base image in deploy-aws.
- Added --quick switch to ./start to skip full Ansible and only run autorun script.
- Skip Isaac Lab Arena installation when the installed git ref already matches the requested one.

v4.0.0-rc1

- Switched to native, source-based installs of Isaac Sim, Lab and others.
- Added support for more apps - Isaac Lab Arena, more to come.
- Added image-aws command for Packer AMI builds and improved CLI options.
- Upgraded to Ubuntu 24.04, updated NVIDIA driver and CUDA tooling.
- Code refactoring and cleanup across cloud providers and deployment scripts.
- Various quality of life improvements for better user experience.

v4.0.0-beta2: Second beta of Isaac Automator v4.

- Packer AMI build now includes a cleanup provisioner to reduce snapshot size
- Packer AMI snapshot wait timeout increased to 2h to avoid build failures on large images
- Updated Ansible run message for Isaac Workstation