beacon-node-builds: allow for repo updates for select builds

Signed-off-by: Jakub Sokołowski <jakub@status.im>

ansible/host_vars/testing-large-01.aws-eu-central-1a.nimbus.pyrmont.yml

@@ -24,3 +24,4 @@ beacon_node_builds_branches:
     version: 'v1.0.8'
     targets: ['nimbus_beacon_node', 'nimbus_signing_process']
     enabled: false
+    update: true

ansible/roles/beacon-node-builds/tasks/build.yml

@@ -13,8 +13,8 @@
     version: '{{ item.version }}'
     dest: '{{ beacon_node_builds_path }}/{{ item.name }}/repo'
     force: true
-    # Don't update or timer might miss some changes
-    update: false
+    # Normally we don't update or timer might miss some changes.
+    update: '{{ item.get("update", false) }}'
   become_user: '{{ beacon_node_builds_user }}'
 
 - name: '{{ item.name }} - Create script'