Set global options

defaults/main.yml

 ---
-# defaults file for gitlab-runner
+# Maximum number of jobs to run concurrently
+gitlab_runner_concurrent: '{{ ansible_processor_cores }}'

tasks/global-setup.yml

+---
+- name: Set concurrent option
+  lineinfile:
+    dest: /etc/gitlab-runner/config.toml
+    regexp: ^concurrent =
+    line: concurrent = {{ gitlab_runner_concurrent }}
+    state: present

tasks/main.yml

@@ -2,3 +2,6 @@
 - name: Install GitLab Runner (RedHat)
   include: install-redhat.yml
   when: ansible_os_family == 'RedHat'
+
+- name: Set global options
+  include: global-setup.yml