Move Pi-hole backup node from Serenity to NOMAD

pihole/nomad/bin/prepare_nomad.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+set -euo pipefail
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+STACK_DIR="$(cd "$SCRIPT_DIR/.." && pwd)"
+ENV_FILE="${ENV_FILE:-$STACK_DIR/.env}"
+DO_UP="${1:-}"
+
+if [[ ! -f "$ENV_FILE" ]]; then
+  echo "Missing $ENV_FILE — copy .env.example to .env and fill in real values first." >&2
+  exit 1
+fi
+
+set -a
+# shellcheck disable=SC1090
+source "$ENV_FILE"
+set +a
+
+mkdir -p \
+  "$APPDATA_PIHOLE_ROOT/etc-pihole" \
+  "$APPDATA_PIHOLE_ROOT/etc-dnsmasq.d" \
+  "$APPDATA_UNBOUND_ROOT/var"
+UNBOUND_TARGET="$APPDATA_UNBOUND_ROOT/unbound.conf"
+UNBOUND_TMP="$APPDATA_UNBOUND_ROOT/.unbound.conf.tmp.$$"
+cp "$STACK_DIR/unbound.conf" "$UNBOUND_TMP"
+mv -f "$UNBOUND_TMP" "$UNBOUND_TARGET"
+if [[ ! -s "$APPDATA_UNBOUND_ROOT/var/root.hints" ]]; then
+  curl -fsSL -o "$APPDATA_UNBOUND_ROOT/var/root.hints" https://www.internic.net/domain/named.cache
+fi
+ENV_FILE="$ENV_FILE" python3 "$STACK_DIR/bin/render_keepalived_conf.py"
+docker compose --env-file "$ENV_FILE" -f "$STACK_DIR/docker-compose.yaml" config >/dev/null
+if [[ "$DO_UP" == "--up" ]]; then
+  docker compose --env-file "$ENV_FILE" -f "$STACK_DIR/docker-compose.yaml" up -d
+  docker compose --env-file "$ENV_FILE" -f "$STACK_DIR/docker-compose.yaml" ps
+fi