Implement new mode "gitlabflow" for collect config

tasks/collect_config/commit/gitlabflow.yml

+---
+# file: roles/drupal/tasks/config_collect/commit/gitlabflow.yml
+
+- include_tasks: git.yml
+  tags:
+    - deploy

tasks/collect_config/finish/gitlabflow.yml

+---
+# file: roles/drupal/tasks/config_collect/finish/gitlabflow.yml
+
+- block:
+
+    - name: Push changes
+      shell: git {{ item }}
+      args:
+        chdir: '{{ webRoot }}'
+      become: no
+      with_items:
+        - checkout develop
+        - merge cc-{{ version }}
+        - push -o ci.skip
+      when: git_status.stdout != ''
+
+    - name: Delete webroot working copy
+      file:
+        path: '{{ webRoot }}'
+        state: absent
+
+    - name: Create MR
+      uri:
+        url: '{{ gitlab_issue.url }}/api/v4/projects/{{ drupal.gitlabid }}/merge_requests'
+        headers:
+          Private-Token: '{{ gitlab_issue.token }}'
+        method: POST
+        status_code: 201
+        body_format: form-urlencoded
+        body:
+          source_branch: develop
+          target_branch: main
+          title: Merging develop into main
+      register: merge_request
+
+    - name: Pause
+      pause:
+        seconds: 5
+
+    - name: Merge
+      uri:
+        url: '{{ gitlab_issue.url }}/api/v4/projects/{{ drupal.gitlabid }}/merge_requests/{{ merge_request["json"]["iid"] }}/merge'
+        headers:
+          Private-Token: '{{ gitlab_issue.token }}'
+        method: PUT
+        status_code: 200
+        body_format: form-urlencoded
+        body:
+          should_remove_source_branch: 0
+
+  tags:
+    - deploy

tasks/collect_config/prepare/gitlabflow.yml

+---
+# file: roles/drupal/tasks/config_collect/prepare/gitlabflow.yml
+
+- block:
+
+    - include_tasks: git.yml
+
+    - name: Checkout working branch
+      shell: git checkout -b cc-{{ version }} HEAD
+      args:
+        chdir: '{{ webRoot }}'
+      become: no
+
+  tags:
+    - deploy