add nodiscc.xsrv.gitea_act_runner ansible role (#142)

- ref. https://gitea.com/gitea/awesome-gitea/pulls/97
- ref. https://github.com/go-gitea/gitea/issues/23704

----

This is similar to https://gitea.com/gitea/awesome-gitea/pulls/97 and I would write a summary for it like I did last time, **but** as you can see, the commit seems to have changed all line endings (I committed from the web interface).

Steps to reproduce:
- Fork https://gitea.com/gitea/awesome-gitea/ from the web UI
- navigate to README.md, click the edit button
- add one line
- select `Create a new branch for this commit and start a Pull Request`, enter a commit message
- click the `Propose file change button`
- the diff shows all lines as changed (217 additions, 216 deletions)

Please let me know how I should proceed.

Reviewed-on: https://gitea.com/gitea/awesome-gitea/pulls/142
Reviewed-by: techknowlogick <techknowlogick@noreply.gitea.com>
Reviewed-by: John Olheiser <john+gitea@jolheiser.com>
Co-authored-by: nodiscc <nodiscc@gmail.com>
Co-committed-by: nodiscc <nodiscc@gmail.com>

README.md

@@ -159,6 +159,7 @@ A curated list of awesome projects related to Gitea and its soft-fork instances.
 
 - [docker-gitea](https://gitea.com/jwobith/docker-gitea) - Docker Gitea Service
 - [nodiscc.xsrv.gitea](https://github.com/nodiscc/xsrv/tree/master/roles/gitea) - Ansible role to install and configure Gitea
+- [nodiscc.xsrv.gitea_act_runner](https://github.com/nodiscc/xsrv/tree/master/roles/gitea_act_runner) - Ansible role to install and configure `act_runner`
 - [solarchemist/gitea](https://codeberg.org/ansible/gitea) - Ansible role to install and configure multiple Gitea instances on the same host.
 
 ## SDK