feat: upgrade from ruby 2.7.6 to 3.0.4

Dockerfile

@@ -8,25 +8,20 @@ ENV BUNDLE_SILENCE_ROOT_WARNING=1
 ADD docker/gemrc /root/.gemrc
 ADD docker/pact /usr/local/bin/pact
 
-# Update from rubygems 2.7.6 to 3.0.3 for security reasons
-# Verify with gem -v
-# TODO: Remove this when it is no longer needed
-# For some reason this line changes the image size from 60 to 80 MB?!?
-
 RUN apk update \
-  && apk add "ruby=2.7.6-r0" \
-             "ruby-bigdecimal=2.7.6-r0" \
-             "ruby-bundler=2.2.20-r0" \
-             "ruby-io-console=2.7.6-r0" \
+  && apk add "ruby=3.0.4-r0" \
+             "ruby-bigdecimal=3.0.4-r0" \
+             "ruby-bundler=2.2.33-r0" \
+             "ruby-io-console=3.0.4-r0" \
              "ca-certificates=20211220-r0" \
              "libressl" \
              "less" \
              "git" \
   && apk add --virtual "build-dependencies" \
-             build-base=0.5-r2 \
-             ruby-dev=2.7.6-r0 \
+             build-base=0.5-r3 \
+             ruby-dev=3.0.4-r0 \
              libressl-dev \
-             ruby-rdoc=2.7.6-r0 \
+             ruby-rdoc=3.0.4-r0 \
   \
   && bundler -v \
   && bundle config build.nokogiri --use-system-libraries \
@@ -52,7 +47,7 @@ ADD lib/pact/cli/version.rb ./lib/pact/cli/version.rb
 RUN bundle config set without 'test development' \
     bundle config set deployment 'true' \
       && bundle install \
-      && find /usr/lib/ruby/gems/2.7.0/gems -name Gemfile.lock -maxdepth 2 -delete
+      && find /usr/lib/ruby/gems/3.0.0/gems -name Gemfile.lock -maxdepth 2 -delete
 ADD docker/entrypoint.sh $HOME/entrypoint.sh
 ADD bin ./bin
 ADD lib ./lib