Add the compose_stack role, inventory and playbooks

One role that syncs a payload and brings the stack up, configured entirely
through stack_* variables, plus six playbooks that each demonstrate one part
of that contract. Every playbook runs standalone and is tagged with its
stack name, so site.yml --tags <stack> works.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>

ansible/roles/compose_stack/meta/main.yml

@@ -0,0 +1,25 @@
+---
+galaxy_info:
+  role_name: compose_stack
+  namespace: example
+  author: The contributors
+  description: Sync a Docker Compose stack payload to a host and bring the stack up.
+  license: MIT
+  min_ansible_version: "2.15"
+  platforms:
+    - name: EL
+      versions:
+        - "9"
+    - name: Debian
+      versions:
+        - bookworm
+    - name: Ubuntu
+      versions:
+        - jammy
+        - noble
+  galaxy_tags:
+    - docker
+    - compose
+    - deployment
+
+dependencies: []