Add isolated kind dependency testbed

tests/kind/setup.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
+source "$ROOT/tests/kind/lib.sh"
+
+USER_KUBECONFIG_BEFORE="$(user_kubeconfig_digest)"
+SUCCEEDED=false
+
+cleanup() {
+  local status=$?
+  trap - EXIT INT TERM
+  if [[ "$SUCCEEDED" != true ]] && [[ "${NUTHATCH_TESTBED_RETAIN:-0}" != 1 ]]; then
+    destroy_fixture || status=1
+  fi
+  if [[ "$(user_kubeconfig_digest)" != "$USER_KUBECONFIG_BEFORE" ]]; then
+    printf 'user kubeconfig changed unexpectedly\n' >&2
+    status=1
+  fi
+  exit "$status"
+}
+
+trap cleanup EXIT
+trap 'exit 130' INT
+trap 'exit 143' TERM
+
+acquire_fixture_lock
+setup_fixture
+SUCCEEDED=true
+printf 'fixture kubeconfig: %s\n' "$KUBECONFIG_PATH"
+printf 'fixture context: %s\n' "$CONTEXT"