Make astrocyte parameter a select on astrocyte form

astrocyte_pkg.yml

@@ -151,10 +151,11 @@ workflow_parameters:
       10x cellranger version.
 
   - id: astrocyte
-    type: string
+    type: select
+    choices:
+      - [ 'true', 'true' ]
     required: true
     default: 'true'
-    regex: "true"
     description: |
       Ensure configuraton for astrocyte.
 

[Gervaise Henry]

Related to #13 (closed)