refactor(vscode-web): migrate to VS Code CLI with code serve-web

- Replace code-server with official VS Code CLI
- Download CLI from code.visualstudio.com using cli-alpine-* URLs
- Add release_channel variable (stable/insiders)
- Add commit_id variable to pin specific VS Code versions
- Support offline mode with fallback to code-server or cached vscode-server
- Add comprehensive bun tests for settings, extensions, and CLI arguments
- Add Terraform tests for variable validation

Author: matifali

registry/coder/modules/vscode-web/README.md

@@ -8,13 +8,13 @@ tags: [ide, vscode, web]
 
 # VS Code Web
 
-Automatically install [Visual Studio Code Server](https://code.visualstudio.com/docs/remote/vscode-server) in a workspace and create an app to access it via the dashboard.
+Automatically install the [VS Code CLI](https://code.visualstudio.com/docs/editor/command-line) and run `code serve-web` in a workspace to access VS Code via the browser.
 
 ```tf
 module "vscode-web" {
   count          = data.coder_workspace.me.start_count
   source         = "registry.coder.com/coder/vscode-web/coder"
-  version        = "1.4.3"
+  version        = "2.0.0"
   agent_id       = coder_agent.example.id
   accept_license = true
 }
@@ -30,7 +30,7 @@ module "vscode-web" {
 module "vscode-web" {
   count          = data.coder_workspace.me.start_count
   source         = "registry.coder.com/coder/vscode-web/coder"
-  version        = "1.4.3"
+  version        = "2.0.0"
   agent_id       = coder_agent.example.id
   install_prefix = "/home/coder/.vscode-web"
   folder         = "/home/coder"
@@ -44,7 +44,7 @@ module "vscode-web" {
 module "vscode-web" {
   count          = data.coder_workspace.me.start_count
   source         = "registry.coder.com/coder/vscode-web/coder"
-  version        = "1.4.3"
+  version        = "2.0.0"
   agent_id       = coder_agent.example.id
   extensions     = ["github.copilot", "ms-python.python", "ms-toolsai.jupyter"]
   accept_license = true
@@ -59,7 +59,7 @@ Configure VS Code's [settings.json](https://code.visualstudio.com/docs/getstarte
 module "vscode-web" {
   count      = data.coder_workspace.me.start_count
   source     = "registry.coder.com/coder/vscode-web/coder"
-  version    = "1.4.3"
+  version    = "2.0.0"
   agent_id   = coder_agent.example.id
   extensions = ["dracula-theme.theme-dracula"]
   settings = {
@@ -69,32 +69,50 @@ module "vscode-web" {
 }
 ```
 
-### Pin a specific VS Code Web version
+### Open an existing workspace on startup
 
-By default, this module installs the latest. To pin a specific version, retrieve the commit ID from the [VS Code Update API](https://update.code.visualstudio.com/api/commits/stable/server-linux-x64-web) and verify its corresponding release on the [VS Code GitHub Releases](https://github.com/microsoft/vscode/releases).
+To open an existing workspace on startup the `workspace` parameter can be used to represent a path on disk to a `code-workspace` file.
+Note: Either `workspace` or `folder` can be used, but not both simultaneously. The `code-workspace` file must already be present on disk.
 
 ```tf
 module "vscode-web" {
-  count          = data.coder_workspace.me.start_count
-  source         = "registry.coder.com/coder/vscode-web/coder"
-  version        = "1.4.3"
-  agent_id       = coder_agent.example.id
-  commit_id      = "e54c774e0add60467559eb0d1e229c6452cf8447"
+  count     = data.coder_workspace.me.start_count
+  source    = "registry.coder.com/coder/vscode-web/coder"
+  version   = "2.0.0"
+  agent_id  = coder_agent.example.id
+  workspace = "/home/coder/coder.code-workspace"
   accept_license = true
 }
 ```
 
-### Open an existing workspace on startup
+### Use VS Code Insiders
 
-To open an existing workspace on startup the `workspace` parameter can be used to represent a path on disk to a `code-workspace` file.
-Note: Either `workspace` or `folder` can be used, but not both simultaneously. The `code-workspace` file must already be present on disk.
+Use the VS Code Insiders release channel to get the latest features and bug fixes:
 
 ```tf
 module "vscode-web" {
-  count     = data.coder_workspace.me.start_count
-  source    = "registry.coder.com/coder/vscode-web/coder"
-  version   = "1.4.3"
-  agent_id  = coder_agent.example.id
-  workspace = "/home/coder/coder.code-workspace"
+  count           = data.coder_workspace.me.start_count
+  source          = "registry.coder.com/coder/vscode-web/coder"
+  version         = "2.0.0"
+  agent_id        = coder_agent.example.id
+  release_channel = "insiders"
+  accept_license  = true
 }
 ```
+
+### Pin a specific VS Code version
+
+Use the `commit_id` variable to pin a specific VS Code Server version by its commit SHA:
+
+```tf
+module "vscode-web" {
+  count          = data.coder_workspace.me.start_count
+  source         = "registry.coder.com/coder/vscode-web/coder"
+  version        = "2.0.0"
+  agent_id       = coder_agent.example.id
+  commit_id      = "e54c774e0add60467559eb0d1e229c6452cf8447"
+  accept_license = true
+}
+```
+
+You can find the commit SHA for a specific VS Code version on the [VS Code releases page](https://code.visualstudio.com/updates) or by checking the "About" dialog in VS Code.