[libdmapsharing] .gitlab-ci.yml: fix syntax

[W. Michael Petullo <wmpetullo src gnome org>]

commit 2c3279b8c912cab55c0ad889cf288c13ee7deb0c
Author: W. Michael Petullo <mike flyn org>
Date:   Fri Jul 3 17:54:56 2020 -0500

    .gitlab-ci.yml: fix syntax

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 361cb98..8e13799 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -17,7 +17,7 @@ build-ubuntu:
     - make clean
 
 build-alpine:
-  image: alpine:arm32v7/latest
+  image: arm32v7/alpine:latest
 
   before_script:
     - apk update