Log real client IPs and enable Gitea Actions with a runner

- Trust X-Forwarded-For from the pod network (10.244.0.0/16) via
  security.REVERSE_PROXY_TRUSTED_PROXIES / REVERSE_PROXY_LIMIT so Gitea
  logs the external client address instead of the ingress-nginx pod IP.
- Set actions.ENABLED explicitly and deploy an instance-wide runner via
  the gitea/actions chart (release "gitea-actions", pinned to 0.1.2).
  The registration token is generated in-cluster and stored in a Secret
  on first run, so no token lives in git or the vault.
- Fix the old actions.yaml, which reused the "gitea" release name and
  would have clobbered the main Gitea release.
- Add a demo workflow (.gitea/workflows/demo.yaml).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tasks/gitea.yaml

@@ -72,6 +72,13 @@
             EMAIL_DOMAIN_BLOCKLIST: "spammer.com,mailinator.com,tempmail.com,10minutemail.com,guerrillamail.com,dispostable.com,fakemail.com,maildrop.cc,trashmail.com,yopmail.com,techstrategylab.com,timminsgoldminetour.com,claxyn.org,sise.claxyn.org,blyxen.com,seti.blyxen.com,tute.blyxen.com,tula.blyxen.com,sise.blyxen.org,ivolix.com,seti.lyvix.org,tute.lyvix.org,seti.ivolix.org,semo.ivolix.com,elyquin.org,simu.elyquin.org,semo.claxyn.com,sise.oxilv.com,simu.glinxy.org,simu.hivoltz.org,semo.elyquin.com,prisite.online,sise.dravix.org,dravix.org,semo.glinxy.com,glinxy.com,dark-webmarket.com,seti.juxal.org,juxal.org,9e5d.getir.space,getir.space,topcompanygroup.com,6d43.getir.space,9e2d.mikrowellen-tests.com,verifiedlinklist.com,xylzen.com,tapi.xylzen.com,ylixo.com,tapi.ylixo.com,tute.ylixo.com,estrella.glinxy.com,nestmailbox.com,theweifamily.icu,1mail.x24hr.com,8.dnsabr.com,23.8.dnsabr.com,2712.bubbles-swimming.co.uk,anonmails.de,spambog.ru,anonmails.de,virginvoyages.click,travellersrest.click,mailus.virginvoyages.com,tula.hivoltz.org,theblueholiday.click,mailius.virginvoyages.com,travellersrest.click,twitch.work,backlinks.monster,onlinecmail.com,gsasearchenginerankervps.com,seoautomationpro.online"
             ENABLE_CAPTCHA: true
             REGISTER_EMAIL_CONFIRM: true
+          security:
+            # Trust X-Forwarded-For from ingress-nginx (pod network) so Gitea
+            # logs the real client address instead of the ingress pod IP.
+            REVERSE_PROXY_LIMIT: 1
+            REVERSE_PROXY_TRUSTED_PROXIES: "{{ gitea_trusted_proxies }}"
+          actions:
+            ENABLED: true
           oauth2_client:
             ENABLE_AUTO_REGISTRATION: true
             UPDATE_AVATAR: true