Dockerfile in uffizzi-cli-0.1.2 vs Dockerfile in uffizzi-cli-0.1.3

@@ -1,9 +1,9 @@
 FROM ruby:3.0.2-alpine3.14
 
 RUN apk update && apk upgrade
 RUN apk add bash
-RUN apk add curl-dev ruby-dev build-base git curl ruby-json openssl
+RUN apk add curl-dev ruby-dev build-base git curl ruby-json openssl groff mandoc man-pages
 
 RUN mkdir -p /gem
 WORKDIR /gem
 
 ENV GEM_HOME="/usr/local/bundle"