Allow to run the role in check mode (#31)

* Detect available mariadb version in check mode

Make sure the task is executed even in check mode to populate
package_version.

* Skip python support in check mode

Avoid the failure to detect pip because pip_requirements is not defined
in check mode.

Author: btravouillon

tasks/detect_mariadb_version.yml

@@ -5,6 +5,7 @@
     state: available
     package_name: "{{ mariadb_server }}"
     repository: "{{ 'MariaDB' if ansible_os_family | lower == 'redhat' and mariadb_use_external_repo else '' }}"
+  check_mode: false
   register: package_version
 
 - name: define mariadb version

tasks/install/python-support.yml

@@ -4,6 +4,7 @@
   when:
     - mariadb_python_packages is defined
     - mariadb_python_packages | length > 0
+    - not ansible_check_mode
   block:
     - name: create pip requirements file
       bodsch.core.pip_requirements: