fix: run verify and generate_pack from any dir

Started outside the repository root, both ended on a FileNotFoundError
traceback: the database and the data registry name files from the root.
They now move to the root after reading the paths the caller typed, which
stay relative to where they were typed.

scripts/generate_pack.py

@@ -3160,6 +3160,12 @@ def _main(held: contextlib.ExitStack) -> None:
         help="Extract and verify pack integrity (path + hash)",
     )
     args = parser.parse_args()
+    from verify import work_from_repo_root
+
+    work_from_repo_root(
+        args, parser,
+        ["db", "platforms_dir", "bios_dir", "output_dir", "emulators_dir", "from_md5_file"],
+    )
     packresolve.set_offline(bool(args.offline))
     if args.platform:
         require_platform(args.platform, args.platforms_dir)