feat: add gitea runner role

- ensure docker is configured
- create runner user/group
- deploy config.yaml from hiera hash
- install runner from url
- register the runner with the gitea instance
- manage the act_runner service

site/profiles/templates/gitea/act_runner.service.erb

@@ -0,0 +1,17 @@
+[Unit]
+Description=Gitea Actions runner
+Documentation=https://gitea.com/gitea/act_runner
+After=docker.service
+
+[Service]
+ExecStart=/usr/local/bin/act_runner daemon --config <%= @home %>/config.yaml
+ExecReload=/bin/kill -s HUP $MAINPID
+WorkingDirectory=<%= @home %>
+TimeoutSec=0
+RestartSec=10
+Restart=always
+User=<%= @user %>
+Group=<%= @group %>
+
+[Install]
+WantedBy=multi-user.target