SciRuby/gnuplotrb

require 'gnuplotrb'
include GnuplotRB

titles = %w{decade Build Test Deploy Overall}
data = [
  [1,  312, 525,  215, 1052],
  [2,  630, 1050, 441, 2121],
  [3,  315, 701,  370, 1386],
  [4,  312, 514,  220, 1046]
]
x = data.map(&:first)
datasets = (1..4).map do |col|
  y = data.map { |row| row[col] }
  Dataset.new([x, y], using: '2:xtic(1)', title: titles[col], file: true)
end

plot = Plot.new(
  *datasets,
  style_data: 'histograms',
  style_fill: 'pattern border',
  yrange: 0..2200,
  xlabel: 'Number of test',
  ylabel: 'Time, s',
  title: 'Time spent to run deploy pipeline'
)

plot.to_png('./gnuplot_gem.png', size: [600, 600])