Add build script.

build.py

@@ -0,0 +1,17 @@
+"""
+Package cardvault using zipapp into an executable zip archive
+"""
+import os
+import zipapp
+
+INTERPRETER = '/usr/bin/env python3'
+TARGET_FILENAME = 'cardvault'
+
+# The bundled file should be placed into the build directory
+target_path = os.path.join(os.path.dirname(__file__), 'build')
+# Make sure it exists
+if not os.path.isdir(target_path):
+    os.mkdir(target_path)
+target = os.path.join(target_path, TARGET_FILENAME)
+# Create archive
+zipapp.create_archive(source='cardvault', target=target, interpreter=INTERPRETER)