Add golang based docker compose tool.

This installs the golang based compose (v2) tool.  Also make it the
python based tool optional, but installed by default.

The docker compose v2 tool comes from either:
 - Disrto   : Moby Engine : docker-compose-v2     : Focal -> Oracular
 - Upstream : Docker Inc  : docker-compose-plugin : Trusty -> Noble

With manual checking I can't see any distro older than focal that makes
use of the install-docker role, and all in-tree users pull from
upstream, so I think adding the golang compose tool without checking
the release is safe.

Change-Id: Ib8b5af40e626cd2d1a12b643f348001b9fdf4586

playbooks/roles/install-docker/defaults/main.yaml

@@ -1,2 +1,3 @@
 use_upstream_docker: True
 docker_update_channel: stable
+with_python_compose: True

playbooks/roles/install-docker/tasks/distro.yaml

@@ -1,5 +1,7 @@
 - name: Install docker
   become: yes
   package:
-    name: docker.io
+    name:
+      - docker.io
+      - docker-compose-v2
     state: present

playbooks/roles/install-docker/tasks/main.yaml

@@ -34,26 +34,29 @@
       - libssl-dev
     state: present
 
-- name: ensure pip3 is installed
+- name: Install python docker-compose if needed
-  include_role:
+  when: with_python_compose|bool
-    name: pip3
+  block:
+  - name: ensure pip3 is installed
+    include_role:
+      name: pip3
 
-- name: Install docker-compose
+  - name: Install docker-compose
-  pip:
+    pip:
-    name:
+      name:
-      # The explicit pin of requests is a temporary workaround to getting
+        # The explicit pin of requests is a temporary workaround to getting
-      # docker-compose functioning again after requests and urllib3 updates.
+        # docker-compose functioning again after requests and urllib3 updates.
-      # Unfortunately python docker-compose is abandonware and we will need
+        # Unfortunately python docker-compose is abandonware and we will need
-      # to migrate to the new docker plugin system or distro packages, but
+        # to migrate to the new docker plugin system or distro packages, but
-      # until then this is a quick workaround that will get things moving
+        # until then this is a quick workaround that will get things moving
-      # again.
+        # again.
-      # The explicit pin of docker is required as py docker 7.0 introduced
+        # The explicit pin of docker is required as py docker 7.0 introduced
-      # incompatibilities with python docker-compose.
+        # incompatibilities with python docker-compose.
-      - requests<2.30.0
+        - requests<2.30.0
-      - docker<7.0.0
+        - docker<7.0.0
-      - docker-compose
+        - docker-compose
-    state: present
+      state: present
-    executable: pip3
+      executable: pip3
 
 - name: Install rsyslog redirector for container tags
   copy:

playbooks/roles/install-docker/tasks/upstream.yaml

@@ -49,6 +49,8 @@
 - name: Install docker
   become: yes
   apt:
-    name: docker-ce
+    name:
+      - docker-ce
+      - docker-compose-plugin
     state: present
     update_cache: yes