ci(workshop): add combined deployment image

scripts/ci/workshop-act.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+set -eu
+
+if ! command -v act >/dev/null 2>&1; then
+  echo "act is required: https://nektosact.com/installation/" >&2
+  exit 1
+fi
+
+socket="${DOCKER_HOST:-}"
+if [ -z "$socket" ]; then
+  socket="$(docker context inspect --format '{{ (index .Endpoints "docker").Host }}' 2>/dev/null || true)"
+fi
+if [ -z "$socket" ]; then
+  socket="unix:///var/run/docker.sock"
+fi
+
+exec act workflow_dispatch \
+  --workflows .github/workflows/deployment-workshop.yml \
+  --job deploy \
+  --env ACT=true \
+  --container-daemon-socket "$socket" \
+  --container-architecture linux/amd64