Download Specific Version

[butschster]

Right now, ctx self-update or ctx update always downloads the latest version.

It would be cool to have an option to:

1. Download a specific version
2. Force re-download even if the same version is already installed

Why

✅ Sometimes we need an old version for testing or compatibility reasons.
✅ In CI/CD pipelines, we may want to pin a specific version.
✅ For debugging, it's useful to rollback to an earlier version.
✅ If the binary is broken or corrupted, it would be nice to re-download the same version.

Suggested Implementation:
Add optional flags:

ctx self-update --version=1.2.3
# or short
ctx update -v 1.2.3

ctx self-update --force
# or
ctx update -f

# Combine both
ctx update -v 1.2.3 -f

List Available Versions (Optional)

Add new command:

ctx versions

It shows available versions from GitHub releases

4. Show Info for Specific Version

Add option to show release description for specific version:

ctx versions -v 1.19.0

Example output:

Version: 1.19.0
Released: 2025-02-15

Changelog:
- Fixed inline config parsing bug
- Improved self-update performance
- Added --env-file option