feat: add support for staging let's encrypt env

nyacme/__main__.py

@@ -21,6 +21,7 @@ def main() -> None:
     )
     parser.add_argument('-c', '--config', help='path to your config file', default='/etc/nyacme.toml')
     parser.add_argument('-o', '--output', help='path to the certificate output directory', default='/etc/ssl/uacme')
+    parser.add_argument('-s', '--staging', help='use staging letsencrypt acme server', default=False, action='store_true')
     args = parser.parse_args()
 
     config = read_config(args.config)
@@ -62,6 +63,7 @@ def main() -> None:
             '--confdir', args.output,
             '-b', '384',
             '--type', 'EC',
+            *(['--staging'] if args.staging else []),
             # '--force',
             'issue',
             *uacme_domains,