[gvfs] ci: Use Buildah instead of Docker to generate images

[Ondrej Holy <oholy src gnome org>]

commit 7ed5785b883a83746a5d7b003cc2f6a8fa9a8ecf
Author: Ondrej Holy <oholy redhat com>
Date:   Fri Feb 12 12:29:47 2021 +0100

    ci: Use Buildah instead of Docker to generate images
    
    The GNOME runners are no more privileged and thus it is not possible to
    use Docker from the pipeline. Let's use Buildah instead Docker to fix
    the image generation.

 .gitlab-ci.yml | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 807ead66..a7ffbba6 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,5 +1,7 @@
 fedora:
-    image: registry.gitlab.gnome.org/gnome/gvfs:latest
+    image:
+        name: registry.gitlab.gnome.org/gnome/gvfs:latest
+        entrypoint: ["/bin/sh", "-c"]
     tags:
         - x86_64
     script:
@@ -10,18 +12,20 @@ fedora:
 
 update-image:
     variables:
-         DOCKER_TLS_CERTDIR: ""
-    image: docker:latest
-    tags:
-        - privileged
-    services:
-        - docker:dind
+         STORAGE_DRIVER: vfs
+         BUILDAH_FORMAT: docker
+         BUILDAH_ISOLATION: chroot
+    image: registry.fedoraproject.org/fedora:33
     script:
-        - docker build --tag $CI_REGISTRY_IMAGE .gitlab-ci/
-        - docker tag $CI_REGISTRY_IMAGE "$CI_REGISTRY_IMAGE:v$CI_JOB_ID"
-        - docker login $CI_REGISTRY -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD
-        - docker push $CI_REGISTRY_IMAGE
+        - dnf install -y buildah runc
+        - sed -i '/^mountopt =.*/d' /etc/containers/storage.conf
+        - buildah bud --tag $CI_REGISTRY_IMAGE -f .gitlab-ci/Dockerfile
+        - buildah tag $CI_REGISTRY_IMAGE "$CI_REGISTRY_IMAGE:v$CI_JOB_ID"
+        - buildah login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+        - buildah push $CI_REGISTRY_IMAGE
+        - buildah push "$CI_REGISTRY_IMAGE:v$CI_JOB_ID"
     when: manual
     only:
         variables:
             - $CI_PROJECT_NAMESPACE == "GNOME"
+