Sorted out .*ignore & *files + removed some fat

Dockerfile

@@ -1,29 +1,37 @@
 FROM ruby:2.5-alpine
-MAINTAINER WPScan Team <team@wpscan.org>
+LABEL maintainer="WPScan Team <team@wpscan.org>"
 
 ARG BUNDLER_ARGS="--jobs=8 --without test"
 
+# Add a new user
 RUN adduser -h /wpscan -g WPScan -D wpscan
+
+# Setup gems
 RUN echo "gem: --no-ri --no-rdoc" > /etc/gemrc
 
 COPY Gemfile /wpscan
 COPY Gemfile.lock /wpscan
 
-# runtime dependencies
+# Runtime dependencies
 RUN apk add --no-cache libcurl procps && \
   # build dependencies
   apk add --no-cache --virtual build-deps alpine-sdk ruby-dev libffi-dev zlib-dev && \
   bundle install --system --gemfile=/wpscan/Gemfile $BUNDLER_ARGS && \
   apk del --no-cache build-deps
 
+# Copy over data & set permissions
 COPY . /wpscan
 RUN chown -R wpscan:wpscan /wpscan
 
-USER wpscan
-
-RUN /wpscan/wpscan.rb --update --verbose --no-color
-
+# Switch directory
 WORKDIR /wpscan
 
+# Switch users
+USER wpscan
+
+# Update WPScan
+RUN /wpscan/wpscan.rb --update --verbose --no-color
+
+# Run WPScan
 ENTRYPOINT ["/wpscan/wpscan.rb"]
 CMD ["--help"]