[evince/wip/gpoo/image-rebuild] ci: Install docker to rebuild image

[Germán Poo-Caamaño <gpoo src gnome org>]

commit 7eb95a1fce1515f471d6339ce27c79699b721c54
Author: Germán Poo-Caamaño <gpoo gnome org>
Date:   Thu Aug 25 12:11:45 2022 -0400

    ci: Install docker to rebuild image

 .gitlab-ci.yml | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5d7a27a8c..b28ca3e60 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -65,16 +65,25 @@ nightly:
         - flatpak
     extends: .publish_nightly
 
-update registry image:
-    image: registry.gitlab.gnome.org/gnome/evince/x86_64-ubuntu:poppler
+update image:
+    variables:
+        IMAGE_TAG: $CI_REGISTRY_IMAGE/x86_64-ubuntu:poppler
+        # Tell 'docker:dind' to enable TLS (recommended)
+        # and generate certificates in the specified directory.
+        DOCKER_TLS_CERTDIR: "/certs"
+    image: docker:latest
     stage: image
+    # Specify an additional image 'docker:dind' ("Docker-in-Docker") that
+    # will start up the Docker daemon when it is brought up by a runner.
+    services:
+        - docker:dind
     script:
         - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
-        - docker build -t $CI_REGISTRY_IMAGE -f .gitlab-ci/ubuntu.Dockerfile
+        - docker build -t $IMAGE_TAG -f .gitlab-ci/ubuntu.Dockerfile
     when: manual
     only:
         - web
-        - main
+    #    - main
     except:
-        variables:
-            - $CI_PROJECT_NAMESPACE != "GNOME"
+       variables:
+           - $CI_PROJECT_NAMESPACE != "GNOME"