Add docker_config module (#38792)

* Add docker_config module

* Address review comments

* Merge description lines

* Stop returning empty config_id in results

* Add integration tests for docker_config

Based on docker_secret's tests.

* Ensure swarm using docker_swarm module

* Add minimum docker / docker api version requirements

ref: https://github.com/ansible/ansible/pull/47046

* Check Docker API version before running tests

ref: https://github.com/ansible/ansible/pull/47340

* Typo

* Wording

* Improve example

* Assert state == absent is idempotent

test/integration/targets/docker_config/aliases

@@ -0,0 +1,4 @@
+shippable/posix/group2
+skip/osx
+skip/freebsd
+destructive

test/integration/targets/docker_config/meta/main.yml

@@ -0,0 +1,3 @@
+---
+dependencies:
+  - setup_docker

test/integration/targets/docker_config/tasks/main.yml

@@ -0,0 +1,7 @@
+- name: Check Docker API version
+  command: "{{ ansible_python.executable }} -c 'import docker; print(docker.from_env().version()[\"ApiVersion\"])'"
+  register: docker_api_version
+  ignore_errors: yes
+
+- include_tasks: test_docker_config.yml
+  when: docker_api_version.rc == 0 and docker_api_version.stdout is version('1.30', '>=')

test/integration/targets/docker_config/tasks/test_docker_config.yml

@@ -0,0 +1,113 @@
+- name: Make sure we're not already using Docker swarm
+  docker_swarm:
+    state: absent
+    force: true
+
+- name: Create a Swarm cluster
+  docker_swarm:
+    state: present
+    advertise_addr: "{{ansible_default_ipv4.address}}"
+
+- name: Parameter name should be required
+  docker_config:
+    state: present
+  ignore_errors: yes
+  register: output
+
+- name: assert failure when called with no name
+  assert:
+    that:
+       - 'output.failed'
+       - 'output.msg == "missing required arguments: name"'
+
+- name: Test parameters
+  docker_config:
+    name: foo
+    state: present
+  ignore_errors: yes
+  register: output
+
+- name: assert failure when called with no data
+  assert:
+    that:
+       - 'output.failed'
+       - 'output.msg == "state is present but all of the following are missing: data"'
+
+- name: Create config
+  docker_config:
+    name: db_password
+    data: opensesame!
+    state: present
+  register: output
+
+- name: Create variable config_id
+  set_fact:
+    config_id: "{{ output.config_id }}"
+
+- name: Inspect config
+  command: "docker config inspect {{ config_id }}"
+  register: inspect
+
+- debug: var=inspect
+
+- name: assert config creation succeeded
+  assert:
+    that:
+       - "'db_password' in inspect.stdout"
+       - "'ansible_key' in inspect.stdout"
+
+- name: Create config again
+  docker_config:
+    name: db_password
+    data: opensesame!
+    state: present
+  register: output
+
+- name: assert create config is idempotent
+  assert:
+    that:
+       - not output.changed
+
+- name: Update config
+  docker_config:
+    name: db_password
+    data: newpassword!
+    state: present
+  register: output
+
+- name: assert config was updated
+  assert:
+    that:
+       - output.changed
+       - output.config_id != config_id
+
+- name: Remove config
+  docker_config:
+    name: db_password
+    state: absent
+
+- name: Check that config is removed
+  command: "docker config inspect {{ config_id }}"
+  register: output
+  ignore_errors: yes
+
+- name: assert config was removed
+  assert:
+    that:
+      - output.failed
+
+- name: Remove config
+  docker_config:
+    name: db_password
+    state: absent
+  register: output
+
+- name: assert remove config is idempotent
+  assert:
+    that:
+      - not output.changed
+
+- name: Remove a Swarm cluster
+  docker_swarm:
+    state: absent
+    force: true