chore(scripts): add engine shell command

Author: NathanFlurry

scripts/run/engine-postgres-shell.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_ROOT="$(cd "${SCRIPT_DIR}/../.." && pwd)"
+
+cd "${REPO_ROOT}"
+
+export RIVET__POSTGRES__URL=postgres://postgres:postgres@localhost:5432/postgres
+export RUST_LOG=debug
+export PATH="${REPO_ROOT}/target/debug:${REPO_ROOT}/target/release:${PATH}"
+
+echo "Opening subshell with Rivet engine environment variables..."
+echo "RIVET__POSTGRES__URL=${RIVET__POSTGRES__URL}"
+echo "RUST_LOG=${RUST_LOG}"
+echo "PATH=${PATH}"
+echo ""
+echo "Type 'exit' to leave the subshell."
+echo ""
+
+# Open subshell (use user's preferred shell or default to bash)
+exec "${SHELL:-bash}"