fix: add shebang to zed coder_script (#504)

## Description

Add `#!/bin/sh` to zed_settings coder_script
<!-- Briefly describe what this PR does and why -->

## Type of Change

- [ ] New module
- [ ] New template
- [X] Bug fix
- [ ] Feature/enhancement
- [ ] Documentation
- [ ] Other

## Module Information

<!-- Delete this section if not applicable -->

**Path:** `registry/coder/modules/zed`  
**New version:** `v1.1.1`  
**Breaking change:** [ ] Yes [X] No

## Testing & Validation

- [X] Tests pass (`bun test`)
- [X] Code formatted (`bun fmt`)
- [X] Changes tested locally

## Related Issues

#482
<!-- Link related issues or write "None" if not applicable -->

Author: DevelopmentCats

registry/coder/modules/zed/README.md

@@ -19,7 +19,7 @@ Zed is a high-performance, multiplayer code editor from the creators of Atom and
 module "zed" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/zed/coder"
-  version  = "1.1.0"
+  version  = "1.1.1"
   agent_id = coder_agent.example.id
 }
 ```
@@ -32,7 +32,7 @@ module "zed" {
 module "zed" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/zed/coder"
-  version  = "1.1.0"
+  version  = "1.1.1"
   agent_id = coder_agent.example.id
   folder   = "/home/coder/project"
 }
@@ -44,7 +44,7 @@ module "zed" {
 module "zed" {
   count        = data.coder_workspace.me.start_count
   source       = "registry.coder.com/coder/zed/coder"
-  version      = "1.1.0"
+  version      = "1.1.1"
   agent_id     = coder_agent.example.id
   display_name = "Zed Editor"
   order        = 1
@@ -57,7 +57,7 @@ module "zed" {
 module "zed" {
   count      = data.coder_workspace.me.start_count
   source     = "registry.coder.com/coder/zed/coder"
-  version    = "1.1.0"
+  version    = "1.1.1"
   agent_id   = coder_agent.example.id
   agent_name = coder_agent.example.name
 }
@@ -73,7 +73,7 @@ You can declaratively set/merge settings with the `settings` input. Provide a JS
 module "zed" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/zed/coder"
-  version  = "1.1.0"
+  version  = "1.1.1"
   agent_id = coder_agent.example.id
 
   settings = jsonencode({

registry/coder/modules/zed/main.tf

@@ -73,6 +73,7 @@ resource "coder_script" "zed_settings" {
   icon         = "/icon/zed.svg"
   run_on_start = true
   script       = <<-EOT
+    #!/bin/sh
     set -eu
     SETTINGS_JSON='${replace(var.settings, "\"", "\\\"")}'
     if [ -z "$${SETTINGS_JSON}" ] || [ "$${SETTINGS_JSON}" = "{}" ]; then