Add fenced attempt mutation and outcome publication

tests/kind/run-attempt-mutations-job.sh

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
+source "$ROOT/tests/kind/lib.sh"
+
+USER_KUBECONFIG_BEFORE="$(user_kubeconfig_digest)"
+SUCCEEDED=false
+OWNS_FIXTURE=false
+
+cleanup() {
+  local status=$?
+  trap - EXIT INT TERM
+  if [[ "${REMORA_TESTBED_RETAIN:-0}" = 1 ]] && [[ "$SUCCEEDED" != true ]]; then
+    printf 'retained kubeconfig: %s\n' "$KUBECONFIG_PATH"
+    printf 'retained context: %s\n' "$CONTEXT"
+    exit "$status"
+  fi
+  if [[ "$OWNS_FIXTURE" = true ]]; 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 "$status"
+}
+
+trap cleanup EXIT
+trap 'exit 130' INT
+trap 'exit 143' TERM
+
+acquire_fixture_lock
+REMORA_REAL_NERDCTL="$(command -v nerdctl)"
+export REMORA_REAL_NERDCTL
+"$REMORA_REAL_NERDCTL" --namespace default build \
+  --file "$ROOT/Dockerfile.test" \
+  --target kind-attempt-mutations-runner \
+  --tag remora-kind-attempt-mutations:local \
+  "$ROOT"
+OWNS_FIXTURE=true
+setup_fixture durable coordination
+load_local_image remora-kind-attempt-mutations:local
+run_job_matrix \
+  attempt-mutations \
+  "$TESTBED/attempt-mutations-job.yaml.in" \
+  remora-kind-attempt-mutations:local \
+  durable coordination
+SUCCEEDED=true
+printf 'attempt mutation package test Jobs passed\n'