Run composer as gitlab-runner in order to have access to private repos as well

tasks/deploy/gitcomposer.yml

@@ -47,6 +47,7 @@
       no_dev: yes
       optimize_autoloader: yes
       prefer_dist: yes
+    become: no
 
   - name: Get Git Tag
     shell: 'git tag --points-at HEAD --sort -version:refname | head -1'