Add isolated kind dependency testbed

tests/kind/provider/nerdctl

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [[ "${1:-}" = run ]]; then
+  shift
+  arguments=()
+  for argument in "$@"; do
+    if [[ "$argument" = kind ]]; then
+      arguments+=(nuthatch-kind)
+    else
+      arguments+=("$argument")
+    fi
+  done
+  exec "$NUTHATCH_REAL_NERDCTL" run --memory 20g --memory-swap 28g --cpus 8 "${arguments[@]}"
+fi
+
+# kind otherwise gives every rootless namespace the same bridge and IPv6 subnet.
+if [[ "${1:-}" = network ]]; then
+  arguments=()
+  for argument in "$@"; do
+    case "$argument" in
+      kind)
+        arguments+=(nuthatch-kind)
+        ;;
+      fc00:f853:ccd:e793::/64)
+        arguments+=(fc00:f853:ccd:e794::/64)
+        ;;
+      --subnet=fc00:f853:ccd:e793::/64)
+        arguments+=(--subnet=fc00:f853:ccd:e794::/64)
+        ;;
+      *)
+        arguments+=("$argument")
+        ;;
+    esac
+  done
+  exec "$NUTHATCH_REAL_NERDCTL" "${arguments[@]}"
+fi
+
+exec "$NUTHATCH_REAL_NERDCTL" "$@"