Deploy edx-themes:master instead of edx-themes:release
Deploy edx-themes:master instead of edx-themes:release

We want the release pipelines to deploy edx-themes:master to avoid
the additional step of merging edx-themes:master to edx-themes:release
in order to deploy changes to edx-themes.

WL-1018

EDUlib/configuration,arbrandes/edx-configuration,proversity-org/configuration,rue89-tech/configuration,proversity-org/configuration,Stanford-Online/configuration,hks-epod/configuration,arbrandes/edx-configuration,rue89-tech/configuration,hastexo/edx-configuration,edx/configuration,gsehub/configuration,proversity-org/configuration,mitodl/configuration,edx/configuration,proversity-org/configuration,arbrandes/edx-configuration,EDUlib/configuration,gsehub/configuration,stvstnfrd/configuration,Stanford-Online/configuration,stvstnfrd/configuration,stvstnfrd/configuration,appsembler/configuration,arbrandes/edx-configuration,mitodl/configuration,hastexo/edx-configuration,hks-epod/configuration,gsehub/configuration,proversity-org/configuration,hastexo/edx-configuration,michaelsteiner19/open-edx-configuration,edx/configuration,michaelsteiner19/open-edx-configuration,rue89-tech/configuration,appsembler/configuration,stvstnfrd/configuration,rue89-tech/configuration,EDUlib/configuration,michaelsteiner19/open-edx-configuration,gsehub/configuration,mitodl/configuration,hastexo/edx-configuration,stvstnfrd/configuration,appsembler/configuration,gsehub/configuration,appsembler/configuration,rue89-tech/configuration,hks-epod/configuration,Stanford-Online/configuration,hastexo/edx-configuration,EDUlib/configuration,mitodl/configuration,arbrandes/edx-configuration,Stanford-Online/configuration,hks-epod/configuration,edx/configuration,michaelsteiner19/open-edx-configuration,hks-epod/configuration,Stanford-Online/configuration,EDUlib/configuration