add Redis session affinity demos (Docker Compose and Kubernetes)

demos/llm_routing/session_affinity_redis_k8s/build-and-push.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+# build-and-push.sh — Build the Plano demo image and push it to your registry.
+#
+# Usage:
+#   ./build-and-push.sh <registry/image:tag>
+#
+# Example:
+#   ./build-and-push.sh ghcr.io/yourorg/plano-redis:latest
+#   ./build-and-push.sh docker.io/youruser/plano-redis:0.4.17
+#
+# The build context is the repository root. Run this script from anywhere —
+# it resolves the repo root automatically.
+
+set -euo pipefail
+
+IMAGE="${1:-}"
+if [ -z "$IMAGE" ]; then
+  echo "Usage: $0 <registry/image:tag>"
+  echo ""
+  echo "Example:"
+  echo "  $0 ghcr.io/yourorg/plano-redis:latest"
+  exit 1
+fi
+
+REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../../.." && pwd)"
+DOCKERFILE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/Dockerfile"
+
+echo "Repository root : $REPO_ROOT"
+echo "Dockerfile      : $DOCKERFILE"
+echo "Image           : $IMAGE"
+echo ""
+
+echo "==> Building image (this takes a few minutes — Rust compile from scratch)..."
+docker build \
+  --file "$DOCKERFILE" \
+  --tag "$IMAGE" \
+  --progress=plain \
+  "$REPO_ROOT"
+
+echo "==> Pushing $IMAGE..."
+docker push "$IMAGE"
+
+echo ""
+echo "Done. Update k8s/plano.yaml:"
+echo "  image: $IMAGE"
+echo ""
+echo "Then deploy with: ./deploy.sh"