Dynamically extract python_ver & postgresql_version

roles/postgresql/tasks/install.yml

@@ -6,13 +6,18 @@
       - python3-psycopg2    # For Ansible modules {postgresql_db, postgresql_user} in Ansible collection community.postgresql -- used in moodle/tasks/install.yml
     state: present
 
+- name: Run shell command "pg_config --version" to extract MAJOR version numner -- strip off MINOR/PATCH version number(s)
+  shell: pg_config --version | sed 's/^[^0-9]*//' | sed 's/[^0-9].*//'
+  register: pg_config_version
+
+- name: 'Dynamically set Ansible var "postgresql_version: {{ pg_config_version.stdout }}"'
+  set_fact:
+    postgresql_version: "{{ pg_config_version.stdout }}"
+
 - name: Install /etc/systemd/system/postgresql-iiab.service from template (0644 by default)
   template:
     src: postgresql-iiab.service
     dest: /etc/systemd/system/postgresql-iiab.service
-    # owner: root
-    # group: root
-    # mode: '0644'
 
 - name: Create PostgreSQL data dir /library/pgsql-iiab, owned by postgres:postgres (0700)
   file: