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パッケージ版のファイルサイズが50MB弱となっていて、その多くを同梱のgemが占めています。不要なファイルをパッケージから除くことで、ファイルサイズを削減します。
.bundle/ruby/*/cache/
に含まれるgemファイルこれにより、ファイルサイズが基本セットで2MB, フルセットで6MB程度となります。
実際には、
gems/gemoji-2.1.0/images/emoji/unicode
とgems/fastimage-1.6.6/test/fixtures
がサイズの大部分を占めるので、ここだけ狙い撃ちで消しても効果あると思います。gemojiライブラリは絵文字有無の判定だけで使っているようなので、imagesディレクトリは使っていません。