* feat: influence parameter defaults through cli flag/env
Add a --parameter-default flag / CODER_RICH_PARAMETER_DEFAULT
environment variable which overrides default values suggested for
parameters.
This allows scripts or middleware wrapping the CLI to substitute
defaults for parameter values beyond those defined at the template
level. For example, Git repository/branch parameters can be given
defaults based on the current checkout, or default parameter values can
be parsed out of files inside the repo.
* Rename defaults arg to defaultOverrides
* chore: add /v2 to import module path
go mod requires semantic versioning with versions greater than 1.x
This was a mechanical update by running:
```
go install github.com/marwan-at-work/mod/cmd/mod@latest
mod upgrade
```
Migrate generated files to import /v2
* Fix gen
* Read params from file for template/workspace creation
* Use os.ReadFile
* Refactor reading params into a separate module
* Add comments and unit tests
* Rename variable
* Uncomment and fix unit test
* Fix comment
* Refactor tests
* Fix unit tests for windows
* Fix unit tests for Windows
* Add comments for the hotfix
