[gnome-runtime-images] Rename the base image file to "Dockerfile"

[Jordan Petridis <jpetridis src gnome org>]

commit 80671bc28445946c1a795ccbf36b426ec6e36b40
Author: Jordan Petridis <jordan centricular com>
Date:   Fri Jul 8 00:16:58 2022 +0300

    Rename the base image file to "Dockerfile"

 .gitlab-ci.yml     | 4 ++--
 base => Dockerfile | 0
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 1d208ad..509018e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -55,14 +55,14 @@ base:
     variables:
         DOCKERIMAGE: ${CI_REGISTRY_IMAGE}/${ARCH}/base
         DOCKERIMAGE_OLD: ${CI_REGISTRY_IMAGE}/base
-        DOCKERFILE: base
+        DOCKERFILE: Dockerfile
 
 base:aarch64:
     stage: base
     extends: ['.dockerfile_template', '.vars_aarch64']
     variables:
         DOCKERIMAGE: ${CI_REGISTRY_IMAGE}/${ARCH}/base
-        DOCKERFILE: base
+        DOCKERFILE: Dockerfile
 
 flat-manager-client:
     stage: base
diff --git a/base b/Dockerfile
similarity index 100%
rename from base
rename to Dockerfile