Add information how to run multi-platform builds with tags to doc/ci/yaml/README.md
What does this MR do?
This MR adds information how to run multi-platform builds with tags to doc/ci/yaml/README.md
.
Are there points in the reviewer needs to double check?
I have not actually tested the jobs.
Why was this MR needed?
There are questions in StackOverflow about how to configure multi-platform builds, see this and this.