fix: Use immutable names for volumes in example templates (#4954)

* fix: Use immutable names for volumes in example templates

This contributes towards #3000, #3386

Related #3409

* Add lifecycle and labels

examples/templates/docker-code-server/main.tf

@@ -54,7 +54,30 @@ resource "coder_app" "code-server" {
 }
 
 resource "docker_volume" "home_volume" {
-  name = "coder-${data.coder_workspace.me.owner}-${data.coder_workspace.me.name}-root"
+  name = "coder-${data.coder_workspace.me.id}-home"
+  # Protect the volume from being deleted due to changes in attributes.
+  lifecycle {
+    ignore_changes = all
+  }
+  # Add labels in Docker to keep track of orphan resources.
+  labels {
+    label = "coder.owner"
+    value = data.coder_workspace.me.owner
+  }
+  labels {
+    label = "coder.owner_id"
+    value = data.coder_workspace.me.owner_id
+  }
+  labels {
+    label = "coder.workspace_id"
+    value = data.coder_workspace.me.id
+  }
+  # This field becomes outdated if the workspace is renamed but can
+  # be useful for debugging or cleaning out dangling volumes.
+  labels {
+    label = "coder.workspace_name_at_creation"
+    value = data.coder_workspace.me.name
+  }
 }
 
 resource "docker_container" "workspace" {
@@ -76,4 +99,21 @@ resource "docker_container" "workspace" {
     volume_name    = docker_volume.home_volume.name
     read_only      = false
   }
+  # Add labels in Docker to keep track of orphan resources.
+  labels {
+    label = "coder.owner"
+    value = data.coder_workspace.me.owner
+  }
+  labels {
+    label = "coder.owner_id"
+    value = data.coder_workspace.me.owner_id
+  }
+  labels {
+    label = "coder.workspace_id"
+    value = data.coder_workspace.me.id
+  }
+  labels {
+    label = "coder.workspace_name"
+    value = data.coder_workspace.me.name
+  }
 }