fix: run coder container as vscode user for ide compatibility (#417)

* fix: correct database hostnames in devcontainer post-start script

Fixes devcontainer startup failure with "exit status 127" error.

Changes:
- Update pg_isready to use localhost instead of db hostname
- Update redis-cli to use localhost instead of redis hostname
- Update connection info messages to reflect localhost usage

Root Cause:
The docker-compose.yml uses `network_mode: service:db` which means
all services (devcontainer, db, redis) share the same network namespace.
In this configuration, services communicate via localhost, not via
service hostnames like 'db' or 'redis'.

Impact:
- Resolves "exit status 127" devcontainer startup errors
- Enables proper PostgreSQL and Redis health checks
- Fixes devcontainer lifecycle scripts execution

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

* fix: make .env file optional and auto-create from example

Fixes devcontainer startup failure when .env file is missing.

Changes:
- Make env_file optional in docker-compose.yml (required: false)
- Auto-create .devcontainer/.env from .env.example in post-create script
- Ensures .env file exists before docker-compose runs

Root Cause:
Docker Compose was failing with "env file not found" error because
.env file wasn't being created in new workspace environments.

Impact:
- Resolves "env file not found" error during devcontainer startup
- Automatically configures environment for both local and Coder workspaces
- No manual .env file creation needed

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

* fix: auto-detect database hostnames for coder and devcontainer

Changes:
- Auto-detect environment using CODER_AGENT_TOKEN variable
- Use 'db'/'redis' hostnames in Coder, 'localhost' in devcontainer
- Fix VS Code server directory permissions
- Update connection info to show correct hostnames

Fixes the 'exit status 127' error and permission issues in Coder.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

* fix: disable coder devcontainer auto-detection

Adds CODER_AGENT_DEVCONTAINERS_ENABLE=0 to agent startup to prevent
Coder from spawning nested devcontainer agent. Template already
manages all containers directly.

Fixes simpleaccounts-uae agent timeout/connection issues.
See: coder/coder#19345

* fix: run coder container as vscode user for ide compatibility

Adds user: vscode:vscode to docker_container resource to match
devcontainer.json remoteUser setting. This fixes permission errors
when VS Code/Cursor tries to create .vscode-server directories.

Fixes: mkdir permission denied errors during IDE connection

---------

Co-authored-by: Mohsin Hashmi <mhashmi@wiser.com>
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: 3 people

.coder/template.tf

@@ -264,6 +264,10 @@ resource "docker_container" "workspace" {
 
   hostname = "simpleaccounts-dev"
 
+  # Run as vscode user (UID 1000, GID 1000) to match devcontainer.json remoteUser setting
+  # This ensures VS Code/Cursor can create .vscode-server directories without permission issues
+  user = "vscode:vscode"
+
   # Resource limits: 2 CPU, 4GB RAM
   memory  = 4096  # 4GB
   # cpus = 2.0 # DISABLED: Causes provider panic (interface conversion: interface {} is string, not float32) in kreuzwerker/docker v3.6.2