Pass {{GITLAB_INSTALL_DIR}} to gitlab-pages/config

Author: sue445

assets/runtime/config/gitlab-pages/config

@@ -5,4 +5,4 @@ auth-secret={{GITLAB_PAGES_ACCESS_SECRET}}
 gitlab-server={{GITLAB_PAGES_ACCESS_CONTROL_SERVER}}
 artifacts-server={{GITLAB_PAGES_ARTIFACTS_SERVER_URL}}
 internal-gitlab-server=http://localhost:8181
-api-secret-key=/home/git/gitlab/.gitlab_pages_secret
+api-secret-key={{GITLAB_INSTALL_DIR}}/.gitlab_pages_secret

assets/runtime/functions

@@ -1792,7 +1792,8 @@ if [[ ${GITLAB_PAGES_ACCESS_CONTROL} == true ]]; then
       GITLAB_PAGES_ACCESS_CLIENT_SECRET \
       GITLAB_PAGES_ACCESS_REDIRECT_URI \
       GITLAB_PAGES_ACCESS_SECRET \
-      GITLAB_PAGES_ACCESS_CONTROL_SERVER
+      GITLAB_PAGES_ACCESS_CONTROL_SERVER \
+      GITLAB_INSTALL_DIR
 
   if [[ -n ${GITLAB_PAGES_ARTIFACTS_SERVER_URL} ]]; then
     update_template ${GITLAB_PAGES_CONFIG} GITLAB_PAGES_ARTIFACTS_SERVER_URL