feat: make shell customizable

hetzner-cloud/cloud-config.yaml.tftpl

@@ -3,7 +3,7 @@ users:
   - name: ${username}
     sudo: ["ALL=(ALL) NOPASSWD:ALL"]
     groups: sudo
-    shell: /bin/bash
+    shell: ${user_shell}
 packages:
   - zsh
   - git

hetzner-cloud/main.tf

@@ -57,6 +57,13 @@ data "coder_parameter" "dotfiles_uri" {
   mutable = true
 }
 
+data "coder_parameter" "user_shell" {
+  name         = "user_shell"
+  display_name = "Default Shell"
+  default      = "/usr/bin/zsh"
+  mutable      = true
+}
+
 data "coder_parameter" "instance_location" {
   name         = "instance_location"
   display_name = "Instance location"
@@ -311,6 +318,7 @@ resource "hcloud_server" "root" {
     install_dotnet_setup    = data.coder_parameter.install_dotnet.value
     install_podman_setup    = data.coder_parameter.install_podman.value
     install_terraform_setup = data.coder_parameter.install_terraform.value
+    user_shell              = data.coder_parameter.user_shell.value
   })
 
   dynamic "network" {