feat: run a terraform plan before creating workspaces with the given template parameters (#1732)

coderd/database/dump.sql

@@ -50,7 +50,8 @@ CREATE TYPE parameter_type_system AS ENUM (
 
 CREATE TYPE provisioner_job_type AS ENUM (
     'template_version_import',
-    'workspace_build'
+    'workspace_build',
+    'template_version_dry_run'
 );
 
 CREATE TYPE provisioner_storage_method AS ENUM (