ops/devops: add offline console runner image scaffold

ops/devops/console/build-runner-image.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Builds the offline console CI runner image with baked npm/Playwright caches.
+# IMAGE_TAG: docker tag to produce (default: stellaops/console-runner:offline)
+# OUTPUT_TAR: optional path to save the image tarball for airgap use.
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+IMAGE_TAG=${IMAGE_TAG:-stellaops/console-runner:offline}
+DOCKERFILE=${DOCKERFILE:-ops/devops/console/Dockerfile.runner}
+APP_DIR=${APP_DIR:-src/Web/StellaOps.Web}
+OUTPUT_TAR=${OUTPUT_TAR:-}
+
+if ! command -v docker >/dev/null 2>&1; then
+  echo "docker not found; install Docker/Podman before building the runner image." >&2
+  exit 1
+fi
+
+docker build -f "$ROOT/$DOCKERFILE" --build-arg APP_DIR="$APP_DIR" -t "$IMAGE_TAG" "$ROOT"
+
+if [[ -n "$OUTPUT_TAR" ]]; then
+  mkdir -p "$(dirname "$OUTPUT_TAR")"
+  docker save "$IMAGE_TAG" -o "$OUTPUT_TAR"
+fi
+
+echo "Runner image built: $IMAGE_TAG"
+if [[ -n "$OUTPUT_TAR" ]]; then
+  echo "Saved tarball: $OUTPUT_TAR"
+fi