test(e2e): Add test for worker-led worker registration (#4014)

* refact(e2e): Create module to run boundary commands

* test(e2e): Add worker-led registration test

enos/modules/docker_boundary_cmd/script_runner.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: BUSL-1.1
+
+# This script initializes a postgres database to work with Boundary by spinning up a temporary
+# Boundary docker container pointed to the specified database and invoking `boundary database init`.
+#
+# This script must only output the JSON that comes from `boundary database init` as the output is
+# consumed by other scripts.
+
+TEST_CONTAINER_NAME=boundary-script-runner
+SOURCE=$(realpath $(dirname ${BASH_SOURCE[0]})) # get directory of this script
+
+docker run \
+    --rm \
+    --name $TEST_CONTAINER_NAME \
+    -e "BOUNDARY_ADDR=$BOUNDARY_ADDR" \
+    -e "LOGIN_NAME=$E2E_PASSWORD_ADMIN_LOGIN_NAME" \
+    -e "BPASS=$E2E_PASSWORD_ADMIN_PASSWORD" \
+    -e "BOUNDARY_TOKEN=$BOUNDARY_TOKEN" \
+    -e "WORKER_TOKEN=$WORKER_TOKEN" \
+    -e "SKIP_CHOWN=true" \
+    --cap-add IPC_LOCK \
+    --network $TEST_NETWORK_NAME \
+    -v "$SCRIPT:/script.sh" \
+    $TEST_BOUNDARY_IMAGE \
+    /bin/sh -c /script.sh