Add pdsadmin script.

pdsadmin.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+set -o errexit
+set -o nounset
+set -o pipefail
+
+PDSADMIN_BASE_URL="https://raw.githubusercontent.com/bluesky-social/pds/main/pdsadmin"
+
+# Command to run.
+COMMAND="${1:-help}"
+shift || true
+
+# Ensure the user is root, since it's required for most commands.
+if [[ "${EUID}" -ne 0 ]]; then
+  echo "ERROR: This script must be run as root"
+  exit 1
+fi
+
+# Download the script, if it exists.
+SCRIPT_URL="${PDSADMIN_BASE_URL}/${COMMAND}.sh"
+SCRIPT_FILE="$(mktemp /tmp/pdsadmin.${COMMAND}.XXXXXX)"
+
+if ! curl --fail --silent --show-error --location --output "${SCRIPT_FILE}" "${SCRIPT_URL}"; then
+  echo "ERROR: ${COMMAND} not found"
+  exit 2
+fi
+
+chmod +x "${SCRIPT_FILE}"
+if "${SCRIPT_FILE}" "$@"; then
+  rm --force "${SCRIPT_FILE}"
+fi