Add build script for generating manifest and packaging

build.py

@@ -0,0 +1,13 @@
+import subprocess
+
+
+def main():
+    # run "python generate-manifest.py deps.txt"
+    subprocess.run(["python", "generate-manifest.py", "deps.txt"])
+
+    # run "package.py"
+    subprocess.run(["python", "package.py"])
+
+
+if __name__ == "__main__":
+    main()