Allow overriding of notes api version

playbooks/roles/edx_notes_api/defaults/main.yml

@@ -27,6 +27,7 @@ EDX_NOTES_API_SECRET_KEY: "i^,9%i=e=y/Nlpb=Mkx!j&,HD9d/17F][9P,FLdwM2+G6|]BEU"
 EDX_NOTES_API_CLIENT_ID: edx_notes_id
 EDX_NOTES_API_CLIENT_SECRET: edx_notes_secret
 EDX_NOTES_API_GIT_SSH_KEY: !!null
+EDX_NOTES_API_VERSION: master
 
 EDX_NOTES_API_DATABASES:
   # rw user
@@ -45,7 +46,7 @@ EDX_NOTES_API_REPOS:
     DOMAIN: "{{ COMMON_GIT_MIRROR }}"
     PATH: "{{ COMMON_GIT_PATH }}"
     REPO: edx-notes-api.git
-    VERSION: master
+    VERSION: "{{ EDX_NOTES_API_VERSION }}"
     DESTINATION: "{{ edx_notes_api_code_dir }}"
     SSH_KEY: "{{ EDX_NOTES_API_GIT_SSH_KEY }}"