Commit 21d9ede

@@ -1,11 +1,16 @@
 FROM docker:stable
-RUN apk add ruby git curl
-RUN gem install bundler -v '~> 2.0' --no-document
+ENV PACKAGES build-base ruby ruby-dev ruby-json ruby-etc git curl
 RUN wget https://github.com/arminc/clair-scanner/releases/download/v12/clair-scanner_linux_amd64 && \
   mv clair-scanner_linux_amd64 /usr/local/bin/clair-scanner && \
   chmod +x /usr/local/bin/clair-scanner
 RUN mkdir -p /examine
 WORKDIR /examine
 COPY . .
-RUN bundle install --jobs "$(nproc)" --quiet
+RUN apk update && \
+  apk upgrade && \
+  apk add $PACKAGES && \
+  rm -fr /var/cache/apk/* && \
+  gem install bundler:'~> 2.0' --no-document && \
+  bundle install --jobs "$(nproc)" --quiet --path vendor/bundle && \
+  apk del build-base
 ENTRYPOINT ["bundle", "exec", "./exe/examine"]

@@ -9,6 +9,6 @@ RSpec::Core::RakeTask.new(:spec)
 RuboCop::RakeTask.new(:rubocop)
 Bundler::Audit::Task.new
 
-desc "run linters"
+desc 'run linters'
 task lint: [:rubocop, 'bundle:audit']
 task default: :spec