refactor: simplify stack templates, move vars into group_vars/alpina

this vault setup for injective sensitive variables uses the approach described in https://docs.ansible.com/ansible/10/tips_tricks/ansible_tips_tricks.html#keep-vaulted-variables-safely-visible

roles/alpina/tasks/deploy_collection.yml

@@ -1,18 +1,15 @@
 - name: Ensure {{ collection }} collection directory exists
   file:
-    path: "{{ my_svc_path }}/{{ collection }}"
+    path: "{{ alpina_svc_path }}/{{ collection }}"
     state: directory
     mode: "700"
 
 - name: Deploy docker compose stacks for {{ collection }}
   vars:
     current_stack_name: "{{ stack }}"
-    current_stack_dest: "{{ my_svc_path }}/{{ collection }}/{{ stack }}"
-    current_stack_source: "{{ role_path }}/collections/{{ collection }}/{{ stack }}"
+    current_stack_dest: "{{ alpina_svc_path }}/{{ collection }}/{{ stack }}"
+    current_stack_source: "{{ role_path }}/templates/{{ collection }}/{{ stack }}"
   include_tasks: deploy_compose_stack.yml
   loop: "{{ stacks }}"
   loop_control:
     loop_var: stack
-
-- debug:
-    var: acme_email