feat(code-server): Expose --extensions-dir to allow for caching of extensions when using a custom install_prefix not in ~/

[michaelbrewer]

In a setup where /workspace is your persistent volume and ~/ is ephemeral
when i install code-server into /workspace any extensions will still be stored in ~/.local/share/code-server/extensions which is lost on restart

Example:

module "code-server" {
  source         = "registry.coder.com/modules/code-server/coder"
  version        = "1.0.10"
  agent_id       = coder_agent.main.id
  folder         = "${local.workspace_home}/${local.folder_name}"
  install_prefix = "${local.workspace_home}/.code-server"
  use_cached     = true
  order          = 2
  slug           = "coder-server"
  settings = {
    "workbench.colorTheme" : "Visual Studio Dark"
    "workbench.startupEditor" : "readme"
  }
   extensions = [
     "ms-python.python",
     "hashicorp.terraform",
     "ms-azuretools.vscode-docker"
  ]
}

A solution could be to expose an option to set the --extensions-dir flag, then all of the extensions would be persisted between restarts

module "code-server" {
  source         = "registry.coder.com/modules/code-server/coder"
  version        = "1.0.10"
  agent_id       = coder_agent.main.id
  folder         = "${local.workspace_home}/${local.folder_name}"
  install_prefix = "${local.workspace_home}/.code-server"
  extensions_dir = "${local.workspace_home}/.code-server/extensions"
  use_cached     = true
  order          = 2
  slug           = "coder-server"
  settings = {
    "workbench.colorTheme" : "Visual Studio Dark"
    "workbench.startupEditor" : "readme"
  }
   extensions = [
     "ms-python.python",
     "hashicorp.terraform",
     "ms-azuretools.vscode-docker"
  ]
}

---

Alternative solution

Alternative solution is to install_prefix and use_cached to make the assumption as to where
the extension_dir should be.

module "code-server" {
  source         = "registry.coder.com/modules/code-server/coder"
  version        = "1.0.10"
  agent_id       = coder_agent.main.id
  folder         = "${local.workspace_home}/${local.folder_name}"
  install_prefix = "${local.workspace_home}/.code-server"
  use_cached     = true
  order          = 2
  slug           = "coder-server"
  settings = {
    "workbench.colorTheme" : "Visual Studio Dark"
    "workbench.startupEditor" : "readme"
  }
   extensions = [
     "ms-python.python",
     "hashicorp.terraform",
     "ms-azuretools.vscode-docker"
  ]
}

More info:

• https://coder.com/docs/code-server/latest/FAQ#where-are-extensions-stored