Add dockerfiles

.dockerignore

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+/videos/
+/videos.db
+/.gitignore

Dockerfile

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+FROM ruby:alpine
+
+RUN apk add make gcc libc-dev
+
+WORKDIR /app
+ADD gems.rb gems.locked ./
+RUN bundle
+
+ADD *.rb ./
+ADD index.html.erb ./
+ADD saca-sapos ./
+
+EXPOSE 4567
+CMD ["bundle", "exec", "ruby", "main.rb"]