Support manifest.json file name option when packaging a plugin.

[RikiyaOta]

Package

• @kintone/plugin-packer

Why

When I developed a kintone plugin, I used the same manifest.json file in dev and prod (but, when using in prod, I modified the content of manifest.json file) 🥺

If I can specify manifest.json file name like manifest-dev.json and manifest-prod.json, I think that we can easily develop in multiple environments 😉

What

I want to add a new option to kintone-plugin-packer CLI: --manifest-file-name MANIFEST_FILE_NAME

Usage I imagined:

$ PLUGIN_DIR='/path/to/your/plugin_dir'
$ kintone-plugin-packer "$PLUGIN_DIR" --manifest-file-name manifest-dev.json

If this option is specified, kintone-plugin-packer searches the file name instead of manifest.json and reads information about the plugin packaged.

I think that the default value of it should be manifest.json.