[TASK] Enable RTD build on release/tag

[christian-herber-nxp]

Is there an existing CV-X-IF task for this?

• I have searched the existing task issues

Task Description

Currently, adding a new release (which includes a tag), does not cause this to show up on read the docs. This should happen automatically.

Description of Done

github releases cause the tag to be added to readthedocs builds

[DBees]

Gathering Observations to see what's going on
(1) Checked that the Github release latest version
https://github.com/openhwgroup/core-v-xif/releases - you have
v1.0.0-rc.2

(2) RTD Project home "Versions"
https://readthedocs.com/projects/openhw-group-core-v-xif/versions/
"Versions" was not listing rc.2 explicitly, but "latest" correctly pointed to rc.2

I have now enabled "activate version" for rc.2, it is now listed as one of the versions available, and latest still pointing to rc.2

(3) RTD Project home "Download"
https://readthedocs.com/projects/openhw-group-core-v-xif/downloads/

It had no mention of rc.2
The Latest PDF document actually shows Release v1.0.0-rc.3-dev.1 on the version page

After "activate version" for rc.2, rc.2 is now listed as one of the versions available.
However, clicking rc.2 PDF
https://docs.openhwgroup.org/_/downloads/openhw-group-core-v-xif/en/v1.0.0-rc.2/pdf/
still leads you to a PDF showing Release v1.0.0-rc.3-dev.1 on the version page