Add more Molecule fixes

- Add STACK_NAME with zuul job
- Slurp isntance config from Zuul controller

Change-Id: Ifec5c21aced37557ef8fba2305e7248760b9a39f

playbooks/molecule/post-run.yaml

@@ -3,12 +3,14 @@
   roles:
     - fetch-output
 
-# NOTE(mnaser): We refresh the inventory to drop all the hosts we've added using
-#               the add_host task to avoid any failures after we destroy.
-- meta: refresh_inventory
-
 - hosts: ubuntu-focal
   tasks:
+    # NOTE(mnaser): We refresh the inventory to drop all the hosts we've added
+    #               using the add_host task to avoid any failures after.
+    - meta: refresh_inventory
+
     - shell: molecule destroy
       args:
         chdir: "{{ zuul.project.src_dir }}"
+      environment:
+        ATMOSPHERE_STACK_NAME: "atmosphere-{{ zuul.build }}"

playbooks/molecule/pre-run.yaml

@@ -25,16 +25,13 @@
     - shell: molecule create
       args:
         chdir: "{{ zuul.project.src_dir }}"
-
-    - shell: molecule prepare
-      args:
-        chdir: "{{ zuul.project.src_dir }}"
+      environment:
+        ATMOSPHERE_STACK_NAME: "atmosphere-{{ zuul.build }}"
 
     - name: Grab the Molecule instance configuration
-      set_fact:
-        molecule_instance_config: "{{ lookup('file', molecule_instance_config_path) | from_yaml }}"
-      vars:
-        molecule_instance_config_path: "{{ ansible_user_dir }}/.cache/molecule/{{ zuul.project.short_name }}/default/instance_config.yml"
+      slurp:
+        src: "{{ ansible_user_dir }}/.cache/molecule/{{ zuul.project.short_name }}/default/instance_config.yml"
+      register: _molecule_instance_config
 
     - name: Add all of the hosts to the inventory
       add_host:
@@ -45,7 +42,7 @@
         ansible_port: "{{ item.port }}"
         ansible_private_key_file: "{{ item.identity_file }}"
         ansible_ssh_extra_args: -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no
-      loop: "{{ molecule_instance_config }}"
+      loop: "{{ _molecule_instance_config['content'] | b64decode | from_yaml }}"
       loop_control:
         label: "{{ item.instance }}"