Automatically tag release branch

[nlam-atlassian]

Problem

Originally, publish_ios was triggered by the tag, and creates the release (using the tag), so that it can upload the ios assets to the release.
publish.yml was triggered by a push to release branch because it uploads to Artifactory, which only allows uploads from the release branch.
Now that I've changed both to trigger on a push to release branch, the ios one is failing because there is no tag.

Changes

I've merged publish_ios.yml and publish.yml into 1 file. When there is a push to release branch, it will automatically tag the commit, publish to artifactory and upload assets to the newly created Github release.

Thanks to @tchernykh for all the ideas/help!

Testing

I've tested the workflow (without the Artifcatory publishing, because that's restricted to release branch) on my branch and it works as expected.