Script cleanup.

tools/build-plugin.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+set -e
+
+# Find project root (one directory above this script)
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+
+cd "$PROJECT_ROOT"
+
+if [[ -x ./mvnw ]]; then
+  ./mvnw package
+else
+  mvn package
+fi