feat: add additional_args variable to code-server module

[blinkagent]

This PR adds an extra_args variable to the code-server module, allowing users to pass additional command-line arguments to code-server.

Changes

• Added additional_args variable to main.tf with a default empty string
• Updated run.sh to include ${ADDITIONAL_ARGS} in the code-server command
• Added documentation and example usage in README.md

Use Case

This solves the issue where users want to disable the workspace trust prompt by passing --disable-workspace-trust to code-server. See the discussion in https://codercom.slack.com/archives/C09H8LRLG8K/p1762983278455979

Example Usage

module "code-server" {
  source               = "registry.coder.com/coder/code-server/coder"
  version              = "1.4.0"
  agent_id             = coder_agent.example.id
  additional_args      = "--disable-workspace-trust"
}

The additional_args variable can accept any additional command-line arguments that code-server supports.

[DevelopmentCats]

Works well for me! made a few changes and bumped the version but this will probably be perfect going forward.