Maintenance: Fixed packager.io RHEL scenario skipping the boot wait before systemd is reachable.

.gitlab/packager.io/scenarios/internal-services/rhel.sh

@@ -2,8 +2,20 @@
 
 set -eu
 
-# Reports "degraded" inside containers, which is fine once boot has finished.
-systemctl is-system-running --wait || true
+# systemd is not reachable yet right after container start, and reports "degraded" inside
+# containers once boot has finished.
+booted=false
+for _ in $(seq 60); do
+  case "$(systemctl is-system-running 2>/dev/null || true)" in
+    running|degraded) booted=true; break ;;
+  esac
+  sleep 1
+done
+
+if [ "$booted" != true ]; then
+  echo "systemd did not finish booting within 60 seconds." >&2
+  exit 1
+fi
 
 dnf install -y zammad