Rollback to github.repository in container image name

This time I think I understood. We publish in the
github.repository_owner's namespace. In my case it's laurent-indermuehle
and in case of upstream it's ansible-collection. A proof of that:
https://github.com/orgs/ansible-collections/packages <- here there is
one attempt I did in february to push my branch to the upstream.
So, our tests containers will be visible to the whole community, not
just community.mysql.

.github/workflows/build-docker-image.yml

@@ -43,7 +43,7 @@ jobs:
         with:
           images:
             "${{ inputs.registry }}\
-            /community.mysql\
+            /${{ github.repository }}\
             /${{ inputs.image_name }}"
           tags: latest