feat: make ephemeral parameters optional (#8571)

docs/cli/create.md

@@ -20,14 +20,6 @@ coder create [flags] [name]
 
 ## Options
 
-### --build-options
-
-|      |                   |
-| ---- | ----------------- |
-| Type | <code>bool</code> |
-
-Prompt for one-time build options defined with ephemeral parameters.
-
 ### --rich-parameter-file
 
 |             |                                         |

docs/templates/parameters.md

@@ -163,6 +163,7 @@ data "coder_parameter" "force_rebuild" {
   type         = "bool"
   description  = "Rebuild the Docker image rather than use the cached one."
   mutable      = true
+  default      = false
   ephemeral    = true
 }
 ```