Fix act_runner: use public Forgejo URL for job container access

Job containers run on runner-jobs network (internet only), so they
can't reach forgejo:3000 (backend-only). Use public https://git.csrx.ru
so both runner and job containers can reach Forgejo.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

roles/services/templates/docker-compose.yml.j2

@@ -346,7 +346,7 @@ services:
     depends_on:
       - forgejo
     environment:
-      - GITEA_INSTANCE_URL=http://forgejo:3000
+      - GITEA_INSTANCE_URL=https://{{ domain_git }}
       - GITEA_RUNNER_REGISTRATION_TOKEN=${FORGEJO_RUNNER_TOKEN}
       - GITEA_RUNNER_NAME=vps-runner
       - CONFIG_FILE=/data/config.yaml