## Description
This PR introduces a `--preset` flag for the `create` command to allow
users to apply a predefined preset to their workspace build.
## Changes
- The `--preset` flag on the `create` command integrates with the
parameter resolution logic and takes precedence over other sources
(e.g., CLI/env vars, last build, etc.).
- Added internal logic to ensure that preset parameters override
parameters values during resolution.
- Updated tests and added new ones to cover these flows.
## Implementation logic
* If a template has presets and includes a default, the CLI will
automatically use the default when `--preset` is not specified.
* If a template has presets but no default, the CLI will prompt the user
to select one when `--preset` is not specified.
* If a template does not have presets, the CLI will not prompt the user
for a preset.
* If the user specifies a preset using the `--preset` flag, that preset
will be used.
* If the user passes `--preset None`, no preset will be applied.
This logic aligns with the behavior in the UI for consistency.
```
> coder create --help
USAGE:
coder create [flags] [workspace]
Create a workspace
- Create a workspace for another user (if you have permission):
$ coder create <username>/<workspace_name>
OPTIONS:
(...)
--preset string, $CODER_PRESET_NAME
Specify the name of a template version preset. Use 'none' to explicitly indicate that no preset should be used.
(...)
-y, --yes bool
Bypass prompts.
```
## Breaking change
**Note:** This is a breaking change to the create CLI command. If a
template includes presets and the user does not provide a `--preset`
flag, the CLI will now prompt the user to select one. This behavior may
break non-interactive scripts or automated workflows.
Relates to PR: https://github.com/coder/coder/pull/18910 - please
consider both PRs together as they’re part of the same workflow
Relates to issue: https://github.com/coder/coder/issues/16594
Susana Ferreira