fix: mount /apps and docker socket in PR workflow build-and-deploy-ci job

The build-and-deploy-ci job failed because /apps/euchre_camp_ci/docker-compose.yml
was not accessible inside the job container. Add volume mounts for /apps and the
docker socket so the job can read the CI compose file and run docker compose commands.

Requires runner config.yaml with valid_volumes for /apps and /var/run/docker.sock.

.gitea/workflows/pr.yml

@@ -37,6 +37,9 @@ jobs:
     container:
       image: docker.notsosm.art/euchre-camp/ci-base:latest
       options: --user root
+      volumes:
+        - /apps:/apps
+        - /var/run/docker.sock:/var/run/docker.sock
 
     steps:
       - name: Checkout code