benchmark app

Graphs of cardano-wallet benchmarks from nightly builds.

http://ec2-18-156-193-207.eu-central-1.compute.amazonaws.com:5555

Test

# Install
git clone https://github.com/piotr-iohk/benchmark_app.git
cd benchmark_app
bundle install

# Configure
export BENCH_DB_PATH=sqlite:/tmp/test.db
export BUILDKITE_API_TOKEN=fake_token
rake db:migrate

# To set up data being downloaded from buildkite set up as a cron job or
# in heroku scheduler
rake bk:latest

# Run all tests
rspec tests

# Open code coverage report
xdg-open coverage/index.html