Add develop to CI

.github/workflows/main_matrix.yml

@@ -2,14 +2,14 @@ name: CI
 on:
   # # Triggers the workflow on push but only for the master branch
   push:
-    branches: [master]
+    branches: [master, develop]
     paths-ignore:
       - "**.md"
       - "version.properties"
 
   # Note: This is different from "pull_request". Need to specify ref when doing checkouts.
   pull_request_target:
-    branches: [master]
+    branches: [master, develop]
     paths-ignore:
       - "**.md"
       #- "**.yml"